STIHL MS Series Gas Powered Chainsaw Instruction Manual

Before using the chain saw, carefully read the safety precautions and working techniques outlined in the manual to reduce the risk of personal injury.

Mounting the Bar and Chain

Follow the instructions provided in the manual to correctly mount the bar and chain on your chainsaw, ensuring proper tensioning.

Fueling

Use the recommended fuel type and follow the fueling instructions to prevent engine damage and ensure optimal performance.

Chain Lubricant
Regularly check and fill the chain oil tank with the appropriate chain lubricant to keep the chain running smoothly during operation.

Starting / Stopping the Engine
Learn how to properly start and stop the engine of your chainsaw to ensure safe operation and longevity of the equipment.

Maintenance and Care

Regular maintenance is crucial for the performance and longevity of your chainsaw. Follow the maintenance guidelines provided in the manual.

FAQs

Q: What type of chain should I use with my STIHL chainsaw?
A: Use STIHL PMMC3 (3/8 Picco) or PMC3 (3/8 Picco) chain depending on the sprocket pitch for reduced kickback and optimal performance.

Q: Where can I find further information about safety precautions?
A: For additional safety information, visit www.stihlusa.com or consult your local STIHL dealer or distributor.

“`

View Fullscreen

Instruction Manual Manual de instrucciones
Warning! To reduce the risk of kickback injury use STIHL reduced kickback bar and STIHL PMMC3 (3/8″ Picco) or PMC3 (3/8″ Picco) chain depending on sprocket pitch or other available low kickback components.

Read and follow all safety precautions in Instruction Manual improper use can cause serious or fatal injury. Lea y siga todas las precauciones de seguridad dadas en el manual de instrucciones el uso incorrecto puede causar lesiones graves o mortales.

Instruction Manual 1 – 60
Manual de instrucciones 61 – 127

Contents

English

Original Instruction Manual

Printed on chlorine-free paper Printing inks contain vegetable oils, paper can be recycled.

Guide to Using this Manual

Safety Precautions and Working

Techniques

Cutting Attachment

Mounting the Bar and Chain (side

chain tensioner)

Mounting the Bar and Chain (quick

chain tensioner)

Tensioning the Saw Chain (side

chain tensioner)

Tensioning the Saw Chain (quick

chain tensioner)

Check Chain Tension

Fuel

Fueling

Chain Lubricant

Filling Chain Oil Tank

Checking Chain Lubrication

Chain Brake

Winter Operation

Information Before You Start

Starting / Stopping the Engine

Operating Instructions

Taking Care of the Guide Bar

Air Filter System

Cleaning the Air Filter

Engine Management

Adjusting the Carburetor

Checking the Spark Plug

Replacing the Starter Rope and

Rewind Spring

Storing the Machine

Checking and Replacing the Chain

Sprocket

Maintaining and Sharpening the

Saw Chain

Maintenance and Care

Main Parts

Specifications

Special Accessories

Ordering Spare Parts

Maintenance and Repairs

STIHL Incorporated Federal

Emission Control Warranty

Statement

STIHL Incorporated California

Exhaust and Evaporative

Emissions Control Warranty

Statement

Trademarks

Allow only persons who fully understand this Manual to operate your chain saw.
To receive maximum performance and satisfaction from your STIHL chain saw, it is important that you read and understand and follow the maintenance and safety precautions in chapter “Safety Precautions and Working Techniques” before using your chain saw. For further information you can go to www.stihlusa.com.
Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this manual.

Warning!

Because a chain saw is a high-speed wood-cutting tool, some special safety precautions must be observed as with any other power saw to reduce the risk of personal injury.
Careless or improper use may cause serious or even fatal injury.
STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements may be made from time-to-time. If the operating characteristics or the appearance of your chain saw differs from those described in this manual, please contact your STIHL dealer for information and assistance.

Pictograms
All the pictograms attached to the machine are shown and explained in this manual.
Symbols in text
The operating and safety instructions are supported by illustrations. The individual steps or procedures described in the manual may be marked in different ways: N A bullet marks a step or procedure
without direct reference to an illustration. A description of a step or procedure that refers directly to an illustration may contain item numbers that appear in the illustration. Example: N Loosen the screw (1) N Lever (2) … In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols and signal words described below:
Danger! indicates an imminent risk of severe or fatal injury.

Warning! indicates a hazardous situation which, if not avoided, could result in severe or fatal injury.
Caution! indicates a risk of property damage, including damage to the machine or its individual components.

Engineering improvements
STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. Therefore, some changes, modifications and improvements may not be covered in this manual. If the operating characteristics or the appearance of your machine differ from those described in this manual, please contact your STIHL dealer for assistance.

Safety Precautions and Working Techniques
Because a chain saw is a high-speed, fast-cutting power tool, special safety precautions must be observed to reduce the risk of personal injury.
It is important that you read, fully understand and observe the following safety precautions and warnings. Read the instruction manual and the safety instructions periodically. Careless or improper use may cause serious or fatal injury.
Warning!
Reactive forces, including kickback, can be dangerous. Pay special attention to the section on reactive forces.
Have your STIHL dealer show you how to operate your power tool. All safety precautions that are generally observed when working with an axe or a hand saw also apply to the operation of chain saws. Observe all applicable federal, state and local safety regulations, standards and ordinances. When using a chain saw for logging purposes, for instance, refer to the OSHA regulations for “logging operations” at 29 Code of Federal Regulations 1910.266.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Warning! Do not lend or rent your power tool without the instruction manual. Be sure that anyone using it understands the information contained in this manual.
Warning! The use of this machine may be hazardous.The saw chain has many sharp cutters. If the cutters contact your flesh, they will cut you, even if the chain is not moving. At full throttle, the chain speed can reach 67 mph (30 m/s). Use your chain saw only for cutting wooden objects.
Warning! Do not use it for other purposes, since misuse may result in personal injury or property damage, including damage to the machine
Warning! Minors should never be allowed to use this power tool. Bystanders, especially children, and animals should not be allowed in the area where it is in use.
Warning! To reduce the risk of injury to bystanders and damage to property, never let your power tool run unattended. When it is not in use (e.g. during a work break), shut it off and make sure that unauthorized persons do not use it.

Most of these safety precautions and warnings apply to the use of all STIHL chain saws. Different models may have different parts and controls. See the appropriate section of your instruction manual for a description of the controls and the function of the parts of your model.
Safe use of a chain saw involves
1 the operator
2 the saw
3 the use of the saw.

THE OPERATOR

Physical Condition
You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol, etc.) which might impair vision, dexterity or judgment. Do not operate this machine when you are fatigued.
Warning! Be alert if you get tired, take a break. Tiredness may result in loss of control. Working with any power tool can be strenuous. If you have any condition that might be aggravated by strenuous work, check with your doctor before operating this machine.
Warning! Prolonged use of a power tool (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud’s phenomenon) or carpal tunnel syndrome.

English
These conditions reduce the hand’s ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.
All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:
Most STIHL power tools are available with an anti-vibration (“AV”) system designed to reduce the transmission of vibrations created by the machine to the operator’s hands. An AV system is recommended for those persons using power tools on a regular or sustained basis.
Wear gloves and keep your hands warm. Heated handles, which are available on some STIHL powerheads, are recommended for cold weather use.
Keep the AV system well maintained. A power tool with loose components or with damaged or worn AV elements will tend to have higher vibration levels. Keep the

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
saw chain sharp. A dull chain will increase cutting time, and pressing a dull chain through wood will increase the vibrations transmitted to your hands. Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressure. Take frequent breaks. All the above-mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore, continual and regular users should closely monitor the condition of their hands and fingers. If any of the above symptoms appear, seek medical advice immediately.
Warning! The ignition system of the STIHL unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with a pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.
Proper Clothing
Warning! To reduce the risk of injury, the operator should wear proper protective apparel.
4

Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Wear long pants made of heavy material to help protect your legs from contact with branches or brush. To reduce the risk of cut injuries, wear pants or chaps that contain pads of cut retardant material. Avoid loose-fitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become caught on branches, brush or the moving parts of the unit. Secure hair so it is above shoulder level.
Good footing is very important. Wear sturdy boots with nonslip soles. Steel-toed safety boots are recommended.
Wear an approved safety hard hat to reduce the risk of injury to your head. Chain saw noise may damage your hearing. Wear sound barriers (ear plugs or ear mufflers) to help protect your hearing. Continual and regular users should have their hearing checked regularly.

Be particularly alert and cautious when wearing hearing protection because your ability to hear warnings (shouts, alarms, etc.) is restricted.
Never operate your power tool unless wearing goggles or properly fitted protective glasses with adequate top and side protection complying with ANSI Z 87.1 (or your applicable national standard). To reduce the risk of injury to your face STIHL recommends that you also wear a face shield or face screen over your goggles or protective glasses.
Always wear gloves when handling the machine and the cutting tool. Heavy-duty, nonslip gloves improve your grip and help to protect your hands.
THE POWER TOOL
For illustrations and definitions of the power tool parts see the chapter on “Main Parts and Controls.”
Warning!
Never modify this power tool in any way. Only attachments supplied by STIHL or expressly approved by STIHL for use with the specific STIHL model are authorized. Although certain unauthorized attachments are useable with STIHL power tools, their use may, in fact, be extremely dangerous.
If this tool is subjected to unusually high loads for which it was not designed (e.g. heavy impact or a fall), always check that it is in good condition before continuing work. Check in particular that

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

the fuel system is tight (no leaks) and that the controls and safety devices are working properly. Do not continue operating this machine if it is damaged. In case of doubt, have it checked by your STIHL servicing dealer.
THE USE OF THE POWER TOOL
Transporting the Power Tool
Warning! To reduce the risk of injury from saw chain contact, never carry or transport your power tool with the saw chain moving. Always engage the chain brake when taking more than a few steps.
Warning! Always switch off the engine, and fit the chain guard (scabbard) over the chain and guide bar before transporting the power tool over longer distances. When transporting it in a vehicle, properly secure it to prevent turnover, fuel spillage and damage to the unit.
It may be carried only in a horizontal position. Grip the front handle in a manner that the machine is balanced

001BA115 KN

horizontally. Keep the hot muffler away from your body and the cutting attachment behind you.
Fuel
Your STIHL power tool uses an oilgasoline mixture for fuel (see the chapter on “Fuel” of your instruction manual).
Warning!
Gasoline is an extremely flammable fuel. If spilled and ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix. Do not smoke or bring any fire or flame near the fuel or the power tool. Note that combustible fuel vapor may escape from the fuel system.
Fueling Instructions
Warning!
Fuel your power tool in well-ventilated areas, outdoors. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the fuel tank depending on the fuel used, the weather conditions and the tank venting system.
In order to reduce the risk of burns and other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on your power tool carefully so as to allow any pressure build-up in the tank to release slowly. Never remove the fuel filler cap while the engine is running.

English
Select bare ground for fueling and move at least 10 feet (3 m) from the fueling spot before starting the engine. Wipe off any spilled fuel before starting your machine.
Warning!
Check for fuel leakage while refueling and during operation. If fuel leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately. Different models may be equipped with different fuel caps.
Cap with grip
Warning!
In order to reduce the risk of fuel spillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.
To do this with this STIHL cap, raise the grip on the top of the cap until it is upright at a 90° angle. Insert the cap in the fuel tank opening with the triangular marks on the grip of the cap and on the fuel tank opening lining up. Using the grip, turn the cap firmly clockwise as far as it will go (approx. a quarter turn).

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Screw cap

Fold the grip flush with the top of the cap. If the grip does not lie completely flush with the cap and the detent on the grip does not fit in the corresponding recess in the filler opening, the cap is not properly seated and tightened and you must repeat the above steps.

Warning!
Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quantities of fuel. In order to reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand as securely as possible.
The screwdriver end of the STIHL combination wrench or other similar tool can be used as an aid in tightening slotted fuel filler caps.
See “Fueling” chapter in your instruction manual.
Before Starting
Take off the chain guard (scabbard) and inspect the saw for proper condition and operation. (See the maintenance chart near the end of the instruction manual.)

Warning!
Always check your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger interlock, stop switch and cutting tool. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices.
Warning!
Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely or securely assembled.
Warning!
Check that the spark plug boot is securely mounted on the spark plug a loose boot may cause arcing that could ignite combustible fumes and cause a fire.
For proper assembly of the bar and chain follow the procedure described in the chapter “Mounting the Bar and Chain” of your instruction manual. STIHL Oilomatic chain, guide bar and sprocket must match each other in gauge and pitch. Before replacing any bar and chain, see the chapter entitled “Specifications” in the instruction manual and the section “Kickback” and the “ANSI B 175.1-2000 chain saw chain saw kickback standard” below.

Warning!
Proper tension of the chain is extremely important. In order to avoid improper setting, the tensioning procedure must be followed as described in your manual. Always make sure the hexagonal nut(s) for the sprocket cover is (are) tightened securely after tensioning the chain in order to secure the bar. Never start the saw with the sprocket cover loose. Check chain tension once more after having tightened the nut(s) and thereafter at regular intervals (whenever the saw is shut off). If the chain becomes loose while cutting, shut off the engine and then tighten. Never try to adjust the chain while the engine is running!
Keep the handles clean and dry at all times; it is particularly important to keep them free of moisture, pitch, oil, fuel mix, grease or resin in order for you to maintain a firm grip and properly control your power tool.
Starting
Warning!
To reduce the risk of fire and burn injuries, start the engine at least 10 feet (3 meters) from the fueling spot, outdoors only.
Start and operate your saw without assistance. For specific starting instructions, see the appropriate section of the instruction manual. Proper starting methods reduce the risk of injury.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Warning! To reduce the risk of injury from chain contact and/or reactive forces, the chain brake must be engaged when starting the saw.
Warning! Do not drop start. This method is very dangerous because you may lose control of the saw. There are two recommended methods for starting your chain saw.
With the first recommended method, the chain saw is started on the ground. Make sure the chain brake is engaged (see “Chain Brake” chapter in your instruction manual) and place the chain saw on firm ground or other solid surface in an open area. Maintain good balance and secure footing. Grip the front handlebar of the saw firmly with your left hand and press down. For saws with a rear handle level with the ground, put the toe of your right foot into the rear handle and press down. With your right hand pull out the starter grip slowly until you feel a definite resistance and then give it a brisk, strong pull.

001BA113 KN 001BA114 KN

The second recommended method for starting your chain saw allows you to start the saw without placing it on the ground. Make sure the chain brake is engaged, grip the front handle of the chain saw firmly with your left hand. Keep your arm on the front handle in a locked (straight) position. Hold the rear handle of the saw tightly between your legs just above the knees. Maintain good balance and secure footing. Pull the starting grip slowly with your right hand until you feel a definite resistance and then give it a brisk, strong pull.
Warning!
Be sure that the guide bar and chain are clear of you and all other obstructions and objects, including the ground. When the engine is started, the engine speed with the starting throttle lock engaged will be fast enough for the clutch to engage the sprocket and, if the chain brake is not activated, turn the chain. If the upper quadrant of the tip of the bar touches any object, it may cause kickback to occur (see section on reactive forces). To reduce this risk, always engage the chain brake before starting. Never attempt to start the chain saw when the guide bar is in a cut or kerf.

English
As soon as the engine is running, immediately blip the throttle trigger, which will disengage the starting throttle lock and allow the engine to settle down to idle.
Warning!
When you pull the starter grip, do not wrap the starter rope around your hand. Do not let the grip snap back, but guide the starter rope to rewind it properly. Failure to follow this procedure may result in injury to your hand or fingers and may damage the starter mechanism.
Important Adjustments
Warning!
To reduce the risk of personal injury from loss of control and/or contact with the running cutting tool, do not use your unit with incorrect idle adjustment. At correct idle speed, the cutting tool should not move. For directions on how to adjust idle speed, see the appropriate section of your instruction manual.
If you cannot set the correct idle speed, have your STIHL dealer check your power tool and make proper adjustments and repairs.
During Operation
Holding and controlling the power tool
Always hold the unit firmly with both hands on the handles while you are working. Wrap your fingers and thumbs around the handles.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

001BA087 LÄ
001BA031 KN

Your right hand should grip the rear handle. This also applies to left-handers. With your hands in this position, you can best oppose and absorb the push, pull and kickback forces of your saw without losing control (see section on reactive forces).
Warning!
To reduce the risk of serious or fatal injury to the operator or bystanders from loss of control, never use the saw with one hand. It is more difficult for you to control reactive forces and to prevent the bar and chain from skating or bouncing along the limb or log. Even for those compact saws designed for use in confined spaces, one-handed operation is dangerous because the operator may lose control.

Warning!
Keep proper footing and balance at all times. Special care must be taken in slippery conditions (wet ground, snow) and in difficult, overgrown terrain. Watch for hidden obstacles such as tree stumps, roots, rocks, holes and ditches to avoid stumbling. There is increased danger of slipping on freshly debarked logs. For better footing, clear away fallen branches, scrub and cuttings. Be extremely cautious when working on slopes or uneven ground.
Warning!
Take extreme care in wet and freezing weather (rain, snow, ice). Put off the work when the weather is windy, stormy or rainfall is heavy.

Warning!
To reduce the risk of cut injuries, keep hands and feet away from the cutting tool. Never touch a moving cutting tool with your hand or any other part of your body.

Warning!
To reduce the risk of injury from loss of control, never work on a ladder or any other insecure support. Never hold the machine above shoulder height. Do not overreach.
Warning!
Never work in a tree unless you have received specific, professional training for such work, are properly secured (such as tackle and harness system or a lift bucket), have both hands free for operating the chain saw in a cramped environment and have taken proper precautions to avoid injury from falling limbs or branches.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Warning!
Even though bystanders should be kept away from the running saw, never work alone. Keep within calling distance of others in case help is needed.

001BA082 KN

Position the chain saw in such a way that your body is clear of the cutting attachment whenever the engine is running. Stand to the left of cut while bucking.
Never put pressure on the saw when reaching the end of a cut. The pressure may cause the bar and rotating chain to pop out of the cut or kerf, go out of control and strike the operator or some other object. If the rotating chain strikes some other object, a reactive force may cause the moving chain to strike the operator.
Working conditions
Operate and start your power tool only outdoors in a well ventilated area. Operate it under good visibility and daylight conditions only. Work carefully.
Warning!
Your chain saw is a one-person machine. Do not allow other persons in the general work area, even when starting. Stop the engine immediately if you are approached.

Warning!
As soon as the engine is running, this product generates toxic exhaust fumes containing chemicals, such as unburned hydrocarbons (including benzene) and carbon monoxide, that are known to cause respiratory problems, cancer, birth defects, or other reproductive harm. Some of the gases (e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of serious or fatal injury/illness from inhaling toxic fumes, never run the machine indoors or in poorly ventilated locations. If exhaust fumes become concentrated due to insufficient ventilation, clear obstructions from work area to permit proper ventilation before proceeding and/or take frequent breaks to allow fumes to dissipate before they become concentrated.

Warning!
Inhalation of certain dusts, especially organic dusts such as mold or pollen, can cause susceptible persons to have an allergic or asthmatic reaction. Substantial or repeated inhalation of dust and other airborne contaminants, in particular those with a smaller particle size, may cause respiratory or other illnesses. This includes wood dust, especially from hardwoods, but also from some softwoods such as Western Red Cedar. Control dust at the source where possible. Use good work practices, such as always cutting with a properly sharpened chain (which produces wood chips rather than fine dust) and operating the unit so that the wind or operating process directs any dust raised by the power tool away from the operator. Follow the recommendations of EPA/OSHA/NIOSH and occupational and trade associations with respect to dust (“particulate matter”). When the inhalation of dust cannot be substantially controlled, i.e., kept at or near the ambient (background) level, the operator and any bystanders should wear a respirator approved by NIOSH/MSHA for the type of dust encountered.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Warning! Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos-containing products have been strictly regulated by OSHA and the Environmental Protection Agency. If you have any reason to believe that you might be cutting asbestos, immediately contact your employer or a local OSHA representative. Operating instructions
Warning! Do not operate your power tool using the starting throttle lock, as you do not have control of the engine speed. In the event of an emergency, switch off the engine immediately move the slide control / stop switch to 0 or STOP.
Warning! Always stop the engine before putting a chain saw down.
Warning! The saw chain continues to move for a short period after the throttle trigger is released (flywheel effect). Accelerating the engine while the saw chain is blocked increases the load and will cause the clutch to slip continuously. This may occur if the throttle is depressed for more than a few seconds when the chain is pinched in the cut or the chain brake is engaged. It can result in overheating and damage to important components (e.g. clutch, polymer

housing components) which can then increase the risk of injury, e.g., from the saw chain moving while the engine is idling.
Warning!
Your chain saw is equipped with a chain catcher. It is designed to reduce the risk of personal injury in the event of a thrown or broken chain. From time to time, the catcher may be damaged or removed. To reduce the risk of personal injury, do not operate a chain saw with a damaged or missing chain catcher.
Warning!
Inspect antivibration elements periodically. Replace damaged, broken or excessively worn antivibration elements immediately, since they may result in loss of control of the saw. A “sponginess” in the feel of the saw, increased vibration or increased “bottoming” during normal operation may indicate damage, breakage or excessive wear. Antivibration elements should always be replaced in sets. If you have any questions as to whether the antivibration elements should be replaced, consult your STIHL servicing dealer.
Warning!
Your saw is not designed for prying or shoveling away limbs, roots or other objects. Such use could damage the cutting attachment or AV system.

Warning!
When sawing, make sure that the saw chain does not touch any foreign materials such as rocks, fences, nails and the like. Such objects may be flung off, damage the saw chain or cause the saw to kickback.
Warning!
The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot.
Warning!
To reduce the risk of fire and burn injury, keep the area around the muffler clean. Remove excess lubricant and all debris such as pine needles, branches or leaves. Let the engine cool down sitting on concrete, metal, bare ground or solid wood (e.g. the trunk of a felled tree) away from any combustible substances.
Warning!
Never modify your muffler. A modified or damaged muffler could cause an increase in heat radiation or sparks, thereby increasing the risk of fire and burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL servicing dealer only.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Catalytic converter
Warning!
Some STIHL power tools are equipped with a catalytic converter, which is designed to reduce the exhaust emissions of the engine by a chemical process in the muffler. Due to this process, the muffler does not cool down as rapidly as conventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries, the following specific safety precautions must be observed.

stay clean and need no service or maintenance. If you experience loss of performance and you suspect a clogged screen, have your muffler maintained by a STIHL servicing dealer.
Reactive forces including kickback
Warning! Reactive forces may occur any time the chain is rotating. Reactive forces can cause serious personal injury.

English

Kickback:

Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched.

001BA093 LÄ
001BA035 KN

Warning!
Since a muffler with a catalytic converter cools down less rapidly than conventional mufflers, always set your power tool down in the upright position and never locate it where the muffler is near dry brush, grass, wood chips or other combustible materials while it is still hot.
Warning!
An improperly mounted or damaged shroud or a damaged/deformed muffler shell may interfere with the cooling process of the catalytic converter. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder shroud or a damaged/deformed muffler shell.
Your catalytic converter is furnished with screens designed to reduce the risk of fire from the emission of hot particles. Due to the heat from the catalytic reaction, these screens will normally

The powerful force used to cut wood can be reversed and work against the operator. If the rotating chain is suddenly stopped by contact with any solid object such as a log or branch or is pinched, the reactive forces may occur instantly. These reactive forces may result in loss of control, which, in turn, may cause serious or fatal injury. An understanding of the causes of these reactive forces may help you avoid the element of surprise and loss of control. Sudden surprise contributes to accidents.
The most common reactive forces are:
kickback,
pushback,
pull-in.

The reaction of the cutting force of the chain causes a rotational force on the chain saw in the direction opposite to the chain movement. This may fling the bar up and back in a lightning fast reaction in an uncontrolled arc mainly in the plane of the bar. Under some cutting circumstances the bar moves towards the operator, who may suffer severe or fatal injury.
Kickback may occur, for example, when the chain near the upper quadrant of the bar nose contacts the wood or is pinched during limbing or when it is incorrectly used to begin a plunge or boring cut.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
The greater the force of the kickback reaction, the more difficult it becomes for the operator to control the saw. Many factors influence the occurrence and force of the kickback reaction. These include chain speed, the speed at which the bar and chain contact the object, the angle of contact, the condition of the chain and other factors.
The type of bar and saw chain you use is an important factor in the occurrence and force of the kickback reaction. Some STIHL bar and chain types are designed to reduce kickback forces. STIHL recommends the use of reduced kickback bars and low kickback chains.
ANSI B 175.1-2000 chain saw kickback standard
§ 5.11 of ANSI standard B 175.1-2000, sets certain performance and design criteria related to chain saw kickback.
To comply with § 5.11 of ANSI B 175.1-2000:
a) Saws with a displacement of less than 3.8 cubic inches (62 cm³)
must, in their original condition, meet a 45° computer derived kickback angle when equipped with certain cutting attachments,
and must be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback chain, reduced kickback bar, etc.
b) Saws with a displacement of 3.8 cubic inches (62 cm³) and above

must be equipped with at least one device designed to reduce the risk of kickback injury, such as a chain brake, low kickback chain, reduced kickback bar, etc.
The computer derived angles for saws below 3.8 cubic inches (62 cm³) displacement are measured by applying a computer program to test results from a kickback test machine.
Warning!
The computer derived angles of § 5.11 of ANSI B 175.1-2000 may bear no relationship to actual kickback bar rotation angles that may occur in real life cutting situations.
In addition, features designed to reduce kickback injuries may lose some of their effectiveness when they are no longer in their original condition, especially if they have been improperly maintained. Compliance with § 5.11 of ANSI B 175.1-2000 does not automatically mean that in a real life kickback the bar and chain will rotate at most 45°.
Warning!
In order for powerheads below 3.8 cubic inches (62 cm³) displacement to comply with the computed kickback angle requirements of § 5.11 of ANSI B 175.1-2000 use only the following cutting attachments:

bar and chain combinations listed as complying in the “Specifications” section of the instruction manual or
other replacement bar and chain combinations marked in accordance with the standard for use on the powerhead or
replacement chain designated “low kickback saw chain.”
See the section on “Low kickback saw chain and reduced kickback bars.”
Devices for reducing the risk of kickback injury
STIHL recommends the use of the STIHL Quickstop chain brake on your powerhead with green labeled reduced kickback bars and low kickback chains.
Warning!
To reduce the risk of injury, never use a saw if the chain brake does not function properly. Take the saw to your local STIHL servicing dealer. Do not use the saw until the problem has been rectified.
STIHL Quickstop chain brake
STIHL has developed a chain stopping system designed to reduce the risk of injury in certain kickback situations. It is called a Quickstop chain brake. The Quickstop chain brake is standard equipment on your STIHL chain saw.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Warning!
Never operate your chain saw without a front hand guard. In a kickback situation this guard helps protect your left hand and other parts of your body. In addition, removal of the hand guard on a saw equipped with a Quickstop chain brake will deactivate the chain brake.

When a kickback occurs, the guide bar may rotate around the front handle. If the cutting position is such that the operator’s left hand is gripping the front handle behind the hand guard, and if the left hand rotates around the front handle and makes a sufficiently forceful contact with the front hand guard, which is the Quickstop activating lever, this contact will activate a properly maintained Quickstop chain brake. The chain brake on newer STIHL chain saws can also be activated by inertia. If the kickback forces are sufficiently high, the hand guard is accelerated towards the bar nose even without hand contact. See the chapter entitled “Chain Brake” of your instruction manual.

001BA174 KN

Warning!
No Quickstop or other chain brake device prevents kickback. These devices are designed to reduce the risk of kickback injury, if activated, in certain kickback situations. In order for the Quickstop to reduce the risk of kickback injury, it must be properly maintained and in good working order. See the chapter of your instruction manual entitled “Chain Brake” and the section “Maintenance, Repair and Storing” at the end of these Safety Precautions. In addition, there must be enough distance between the bar and the operator to ensure that the Quickstop has sufficient time to activate and stop the chain before potential contact with the operator.
Warning!
An improperly maintained chain brake may increase the time needed to stop the chain after activation, or may not activate at all.

Warning!
Never run the chain saw above idle speed for more than 3 seconds when the chain brake is engaged or when the chain is pinched or otherwise caught in the cut. Clutch slippage can cause excessive heat, leading to severe damage of the motor housing, clutch and oiler component and may interfere with the operation of the chain brake. If clutch slippage in excess of 3 seconds has occurred, allow the motor housing to cool before proceeding and check the operation of your chain brake as described in the chapter entitled “Chain Brake” of your instruction manual. Also make sure that the chain is not turning at idle speed (see above at “Important Adjustments”).
Low kickback saw chain and reduced kickback bars
STIHL offers a variety of bars and chains. STIHL reduced kickback bars and low kickback chains are designed to reduce the risk of kickback injury. Other chains are designed to obtain higher cutting efficiency or sharpening ease but may result in higher kickback tendency.
STIHL has developed a color code system to help you identify the STIHL reduced kickback bars and low kickback chains. Cutting attachments with green warning decals or green labels on the packaging are designed to reduce the risk of kickback injury. The matching of green decaled powerheads under 3.8 cubic inches (62 cm³) displacement with green labeled bars and green labeled chains gives compliance with the computed kickback angle requirements of ANSI B 175.1-2000

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
when the products are in their original condition. Products with yellow decals or labels are for users with extraordinary cutting needs and experience and specialized training for dealing with kickback.
STIHL recommends the use of its green labeled reduced kickback bars, green labeled low kickback chains and a STIHL Quickstop chain brake for both experienced and inexperienced chain saw users.
Please ask your STIHL dealer to properly match your powerhead with the appropriate bar/chain combination to reduce the risk of kickback injury. Green labeled bars and chains are recommended for all powerheads.
Warning!
Use of other, non-listed bar/chain combinations may increase kickback forces and the risk of kickback injury. New bar/chain combinations may be developed after publication of this literature, which will, in combination with certain powerheads, comply with § 5.11 of ANSI B 175.1-2000. Check with your STIHL dealer for such combinations.
Warning!
Reduced kickback bars and low kickback chains do not prevent kickback, but they are designed to reduce the risk of kickback injury. They are available from your STIHL dealer.

Warning!
Even if your saw is equipped with a Quickstop, a reduced kickback bar and/or low kickback chain, this does not eliminate the risk of injury by kickback. Therefore, always observe all safety precautions to avoid kickback situations.
Low kickback chain
Some types of saw chain have specially designed components to reduce the force of nose contact kickback. STIHL has developed low kickback chain for your powerhead.
“Low kickback saw chain” is a chain which has met the kickback performance requirements of § 5.11.2.4 of ANSI B 175.1-2000 (GasolinePowered Chain SawsSafety Requirements) when tested in its original condition on a selected representative sample of chain saws below 3.8 cubic inches (62 cm³) displacement specified in ANSI B 175.1-2000.
Warning!
There are potential powerhead and bar combinations with which low kickback saw chains can be used which have not been specifically certified to comply with the 45° computer derived kickback angle of § 5.11 of ANSI B 175.1-2000. Some low kickback chains have not been tested with all powerhead and bar combinations.

Warning!
A dull or improperly sharpened chain may reduce or negate the effects of the design features intended to reduce kickback energy. Improper lowering or sharpening of the depth gauges or shaping of the cutters may increase the chance and the potential energy of a kickback. Always cut with a properly sharpened chain.
Reduced kickback bars
STIHL green labeled reduced kickback bars are designed to reduce the risk of kickback injury when used with STIHL green labeled low kickback chains.
Warning!
When used with other, more aggressive chains, these bars may be less effective in reducing kickback.
Bow Guides
Warning!
Do not mount a bow guide on any STIHL chain saw. Any chain saw equipped with a bow guide is potentially very dangerous. The risk of kickback is increased with a bow guide because of the increased kickback contact area. Low kickback chain will not significantly reduce the risk of kickback injury when used on a bow guide.
To avoid kickback
The best protection from personal injury that may result from kickback is to avoid kickback situations:

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

1. Hold the chain saw firmly with both hands and maintain a secure grip. Don’t let go.
2. Be aware of the location of the guide bar nose at all times.
3. Never let the nose of the guide bar contact any object. Do not cut limbs with the nose of the guide bar. Be especially careful near wire fences and when cutting small, tough limbs, small size brush and saplings which may easily catch the chain.
4. Don’t overreach.
5. Don’t cut above shoulder height.
6. Begin cutting and continue at full throttle.
7. Cut only one log at a time.
8. Use extreme caution when reentering a previous cut.
9. Do not attempt to plunge cut if you are not experienced with these cutting techniques.
10. Be alert for shifting of the log or other forces that may cause the cut to close and pinch the chain.
11. Maintain saw chain properly. Cut with a correctly sharpened, properly tensioned chain at all times.
12. Stand to the side of the cutting path of the chain saw.

A = Pull-in
A
Pull-in occurs when the chain on the bottom of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward and may cause the operator to lose control. Pull-in frequently occurs when the bumper spike of the saw is not held securely against the tree or limb and when the chain is not rotating at full speed before it contacts the wood.
Warning! Use extreme caution when cutting small size brush and saplings which may easily catch the chain, be whipped towards you or pull you off balance. To avoid pull-in 1. Always start a cut with the chain
rotating at full speed and the bumper spike in contact with the wood. 2. The risk of pull-in may also be reduced by using wedges to open the kerf or cut.

001BA037 KN 001BA038 KN

B = Pushback

English

B
Pushback occurs when the chain on the top of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain may drive the saw rapidely straight back toward the operator and may cause loss of saw control. Pushback frequently occurs when the top of the bar is used for cutting.
To avoid pushback
1. Be alert to forces or situations that may cause material to pinch the top of the chain.
2. Do not cut more than one log at a time.
3. Do not twist the saw when withdrawing the bar from a plunge cut or underbuck cut because the chain can pinch.
Cutting Techniques
Felling
Felling is cutting down a tree.
Before felling a tree, consider carefully all conditions which may affect the direction of fall.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Warning!
There are a number of factors that may affect and change the intended direction of fall, e.g. wind direction and speed, lean of tree, surrounding trees and obstacles, sloping ground, one-sided limb structure, wood structure, decay, snow load, etc. To reduce the risk of severe or fatal injury to yourself or others, look for these conditions prior to beginning the cut, and be alert for a change in direction while the tree is falling.
Warning!
Always observe the general condition of the tree. Inexperienced users should never attempt to cut trees that are decayed or rotted inside or that are leaning or otherwise under tension. There is an increased risk that such trees could snap or split while being cut and cause serious or fatal injury to the operator or bystanders. Also look for broken or dead branches which could vibrate loose and fall on the operator. When felling on a slope, the operator should stand on the uphill side if possible.

Felling Instructions

1/2

21/2

When felling, maintain a distance of at least 2 1/2 tree lengths from the nearest person.
When felling in the vicinity of roads, railways and power lines, etc., take extra precautions. Inform the police, utility company or railway authority before beginning to cut.

Warning!
The noise of your engine may drown any warning call.

001BA088 LÄ
001BA040 KN

Escape path
A

B
45° 45°
B

First clear the tree base and work area from interfering limbs and brush and clean its lower portion with an ax.
Then, establish two paths of escape (B) and remove all obstacles. These paths should be generally opposite to the planned direction of the fall of the tree (A) and about at a 45° angle. Place all tools and equipment a safe distance away from the tree, but not on the escape paths.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Buttress roots

Conventional cut

Open-face technique

English

If the tree has large buttress roots, cut into the largest buttress vertically first (horizontally next) and remove the resulting piece.
Gunning sight

001BA146 KN

C C

001BA143 KN

When making the felling notch, use the gunning sight on the shroud and housing to check the desired direction of fall:
Position the saw so that the gunning sight points exactly in the direction you want the tree to fall.

001BA153 KN

Felling notch (C) determines the direction of the fall
For a conventional cut:
N Properly place felling notch perpendicular to the line of fall, close to the ground.
N Cut down at approx. 45° angle to a depth of about 1/5 to 1/4 of the trunk diameter.
N Make second cut horizontal.
N Remove resulting 45° piece.

Felling notch (C) determines the direction of the fall
For an open-face cut:
N Properly place felling notch perpendicular to the line of fall, close to the ground.
N Cut down at approx. 50° angle to a depth of approx.1/5 to 1/4 of the trunk diameter.
N Make second cut from below at approx. 40 degree angle.
N Remove resulting 90° piece.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English Making sapwood cuts

D =Felling cut

E = Hinge
E D

001BA150 KN 001BA144 KN 001BA145 KN

N For medium sized or larger trees make cuts at both sides of the trunk, at same height as subsequent felling cut.
N Cut to no more than width of guide bar.
This is especially important in softwood in summer it helps prevent sapwood splintering when the tree falls.

Conventional and open-face technique:
N Begin 1 to 2 inches (2,5 to 5 cm) higher than center of felling notch.
N Cut horizontally towards the felling notch.
N Leave approx.1/10 of diameter uncut. This is the hinge.
N Do not cut through the hinge you could lose control of the direction of the fall.
Drive wedges into the felling cut where necessary to control the fall.

N Helps control the falling tree.
N Do not cut through the hinge you could lose control of the direction of the fall.

Warning!
If the tip of the bar contacts a wedge, it may cause kickback. Wedges should be of wood or plastic never steel, which can damage the chain.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Felling cut for small diameter trees: simple fan cut

Felling cut for large diameter trees

English
2 4

001BA147 KN 001BA148 KN

Engage the bumper spikes of the chain saw directly behind the location of the intended hinge and pivot the saw around this point only as far as the hinge. The bumper spike rolls against the trunk.

Warning!
Felling a tree that has a diameter greater than the length of the guide bar requires use of either the sectioning felling cut or plunge-cut method. These methods are extremely dangerous because they involve the use of the nose of the guide bar and can result in kickback. Only properly trained professionals should attempt these techniques.
Sectioning method
For the sectioning method make the first part of the felling cut with the guide bar fanning in toward the hinge. Then, using the bumper spike as a pivot, reposition the saw for the next cut.

Avoid repositioning the saw more than necessary. When repositioning for the next cut, keep the guide bar fully engaged in the kerf to keep the felling cut straight. If the saw begins to pinch, insert a wedge to open the cut. On the last cut, do not cut the hinge.
Plunge-cut method
Timber having a diameter more than twice the length of the guide bar requires the use of the plunge-cut method before making the felling cut.
First, cut a large, wide felling notch. Make a plunge cut in the center of the notch.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
The plunge cut is made with the guide bar nose. Begin the plunge cut by applying the lower portion of the guide bar nose to the tree at an angle. Cut until the depth of the kerf is about the same as the width of the guide bar. Next, align the saw in the direction in which the recess is to be cut. With the saw at full throttle, insert the guide bar in the trunk.
Enlarge the plunge cut as shown in the illustration.
Warning! There is an extreme danger of kickback at this point. Extra caution must be taken to maintain control of the saw. To make the felling cut, follow the sectioning method described previously.

If you are inexperienced with a chain saw, plunge-cutting should not be attempted. Seek the help of a professional.
Warning!
In order to reduce the risk of personal injury, never stand directly behind the tree when it is about to fall, since part of the trunk may split and come back towards the operator (barber-chairing), or the tree may jump backwards off the stump. Always keep to the side of the falling tree. When the tree starts to fall, withdraw the bar, shut off the engine and walk away on the preplanned escape path. Watch out for falling limbs.
Warning!
Be extremely careful with partially fallen trees which are poorly supported. When the tree hangs or for some other reason does not fall completely, set the saw aside and pull the tree down with a cable winch, block and tackle or tractor. If you try to cut it down with your saw, you may be injured.
Limbing
Limbing is removing the branches from a fallen tree.
Warning!
There is an extreme danger of kickback during the limbing operation. Do not work with the nose of the bar. Be extremely cautious and avoid contacting the log or other limbs with the nose of the guide bar.

Do not stand on a log while limbing it you may slip or the log may roll. Start limbing by leaving the lower limbs to support the log off the ground. When underbucking freely hanging limbs, a pinch may result or the limb may fall, causing loss of control. If a pinch occurs, stop the engine and remove the saw by lifting the limb.
Warning! Be extremely cautious when cutting limbs or logs under tension (spring poles). The limbs or logs could spring back toward the operator and cause loss of control of the saw and severe or fatal injury to the operator. Bucking
Bucking is cutting a log into sections.

001BA033 KN

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Warning!
When bucking, do not stand on the log. Make sure the log will not roll downhill. If on a slope, stand on the uphill side of the log. Watch out for rolling logs.
Cut only one log at a time.
Shattered wood should be cut very carefully. Sharp slivers of wood may be caught and flung in the direction of the operator of the saw.

English

maintained properly or if

nonapproved replacement parts were

used, STIHL may deny coverage.

001BA151 KN

Warning!
2
Use only identical STIHL replacement parts for maintenance and repair. Use of non-STIHL parts may cause serious or fatal injury.

Strictly follow the maintenance and

repair instructions in the appropriate

section of your instruction manual.

Please refer to the maintenance chart in

this manual.

001BA152 KN

When cutting small logs, place log through “V” shaped supports on top of a sawhorse. Never permit another person to hold the log. Never hold the log with your leg or foot.

001BA051 LÄ

Logs under strain:
Risk of pinching! Always start relieving cut (1) at compression side.Then make bucking cut (2) at tension side. If the saw pinches, stop the engine and remove it from the log.
Only properly trained professionals should work in an area where the logs, limbs and roots are tangled. Working in “blow down” areas is extremely hazardous. Drag the logs into a clear area before cutting. Pull out exposed and cleared logs first.
MAINTENANCE, REPAIR AND STORING
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However, if you make a warranty claim for a component which has not been serviced or

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Warning! Always stop the engine and make sure that the cutting tool is stopped before doing any maintenance or repair work or cleaning the power tool.
Warning! Do not attempt any maintenance or repair work not described in your instruction manual. Have such work performed by your STIHL servicing dealer only. For example, if improper tools are used to remove the flywheel or if an improper tool is used to hold the flywheel in order to remove the clutch, structural damage to the flywheel could occur and could subsequently cause the flywheel to burst. Wear gloves when handling or performing maintenance on saw chains.
21

English
Warning!
Use the specified spark plug and make sure it and the ignition lead are always clean and in good condition. Always press spark plug boot snugly onto spark plug terminal of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be securely attached.) A loose connection between spark plug terminal and the ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.
Warning!
Never test the ignition system with the spark plug boot removed from the spark plug or with a removed spark plug, since uncontained sparking may cause a fire.
Warning!
Do not operate your chain saw if the muffler is damaged, missing or modified. An improperly maintained muffler will increase the risk of fire and hearing loss.
If your muffler was equipped with a spark-arresting screen to reduce the risk of fire, never operate your saw if the screen is missing or damaged. Remember that the risk of forest fires is greater in hot or dry weather.
Keep the chain, bar and sprocket clean; replace worn sprockets or chains. Keep the chain sharp. You can spot a dull chain when easy-to-cut wood becomes hard to cut and burn marks appear on the wood. Keep the chain at proper tension.

Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use.
Warning!
In order for the chain brake on your STIHL chain saw to properly perform its function of reducing the risk of kickback and other injuries, it must be properly maintained. Like an automobile brake, a chain saw chain brake incurs wear each time it is engaged.
The amount of wear will vary depending upon usage, conditions under which the saw is used and other factors. Excessive wear will reduce the effectiveness of the chain brake and can render it inoperable.
For the proper and effective operation of the chain brake, the brake band and clutch drum must be kept free of dirt, grease and other foreign matter which may reduce friction of the band on the drum.
For these reasons, each STIHL chain saw should be returned to trained personnel such as your STIHL servicing dealer for periodic inspection and servicing of the brake system according to the following schedule:
Heavy usage – every three months, Moderate usage – twice a year, Occasional usage – annually.
The chain saw should also be returned immediately for maintenance whenever the brake system cannot be thoroughly cleaned or there is a change in its operating characteristics.

For any maintenance of the emission control system please refer to the maintenance chart and to the limited warranty statement near the end of the instruction manual.
Store chain saw in a dry place and away from children. Before storing for longer than a few days, always empty the fuel tank (see chapter “Storing the Machine” in the instruction manual).

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Cutting Attachment
STIHL is the only manufacturer in the industry to produce its own chain saws, guide bars, saw chains and chain sprockets. A cutting attachment consists of the saw chain, guide bar and chain sprocket. The cutting attachment that comes standard is designed to exactly match the chain saw.
1 2

001BA191 KN

t = a : 2

The pitch (t) of the saw chain (1), chain sprocket and the nose sprocket of the Rollomatic guide bar must match.
The drive link gauge (2) of the saw chain (1) must match the groove width of the guide bar (3).
If non-matching components are used, the cutting attachment may be damaged beyond repair after a short period of operation.

Mounting the Bar and Chain (side chain tensioner)
N Unscrew the nut and remove the chain sprocket cover.
4
5
N Turn the screw (4) counterclockwise until the tensioner slide (5) butts against the left end of the housing slot.
6
N Disengage the chain brake by pulling the hand guard (6) against the front handle.

001BA108 KN

001BA107 KN

533BA001 KN

Wear work gloves to protect your hands from the sharp cutters.
N Fit the chain start at the bar nose.

8 10

001BA109 KN

N Fit the guide bar over the studs (7) cutting edges on top of bar must point to the right and engage the peg of the tensioner slide in locating hole (8) place the chain over the sprocket (9) at the same time.
N Turn the tensioning screw (10) clockwise until there is very little chain sag on the underside of the bar and the drive link tangs are engaged in the bar groove.
N Refit the sprocket cover and screw on the nut only fingertight.
N Go to chapter on “Tensioning the Saw Chain”

143BA003 KN

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Mounting the Bar and Chain (quick chain tensioner)

7 9

140BA003 KN

4 6
5

N Line up the tensioning gear (7) and guide bar (9).

140BA000 KN

N Pull out the hinged clip (4) so that it snaps into position.
N Turn the wingnut (5) counterclockwise until it hangs loose in the sprocket cover (6).
N Removing the sprocket cover

8
N Insert the screw (8) and tighten it down firmly.

135BA007 KN

7
Wear work gloves to protect your hands from the sharp cutters. N Fit the chain start at the bar nose. Pay attention to the position of the tensioning gear and the cutting edges. N Turn the tensioning gear (7) clockwise as far as stop.

140BA004 KN

140BA001 KN

N Remove the tensioning gear (7) and

turn it over.

140BA005 KN

8
N Take out the screw (8). 24

140BA002 KN

N Disengage the chain brake by pulling the hand guard (9) against the front handle.
N Turn the guide bar so that the tensioning gear is facing you.
MS 171, MS 181, MS 181 C, MS 211, MS 211 C

11 10

English
Tensioning the Saw Chain (side chain tensioner)

135BA012 KN

140BA006 KN

142BA063 KN

N Fit the chain over the sprocket (10). N Push the guide bar over the bar
stud (11), the head of the rear bar stud must engage the slot.
N Make sure the drive link tangs engage the bar groove (see arrow) and then rotate the tensioning gear counterclockwise as far as stop.

135BA011 KN

N Place the chain sprocket cover in position and engage the guide lugs in the recesses in the engine housing.
12 13
When fitting the chain sprocket cover, check that the teeth of the tensioning gear and adjusting wheel mesh properly. N If necessary, turn the adjusting
wheel (12) slightly until the sprocket cover can be pushed flush against the engine housing. N Pull out the hinged clip (13) so that it snaps into position. N Engage wingnut and tighten it down moderately. N Go to chapter on “Tensioning the Saw Chain”

140BA007 KN

1
Retensioning during cutting work: N Switch off the engine. N Loosen the nut. N Hold the bar nose up. N Use a screwdriver to turn the
tensioning screw (1) clockwise until the chain fits snugly against the underside of the bar. N While still holding the bar nose up, tighten down the nut firmly. N Go to “Checking Chain Tension”.
A new chain has to be retensioned more often than one that has been in use for some time. N Check chain tension frequently
see chapter on “Operating Instructions”.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Tensioning the Saw Chain (quick chain tensioner)
1
2
Retensioning during cutting work: N Shut off the engine. N Pull out the hinged clip and loosen
the wingnut. N Turn the adjusting wheel (1)
clockwise as far as stop. N Tighten down the wingnut (2) firmly
by hand. N Fold down the hinged clip. N Go to “Tensioning the Saw Chain” A new chain has to be retensioned more often than one that has been in use for some time. N Check chain tension frequently
see chapter on “Operating Instructions”.

001BA112 KN 142BA064 KN

Check Chain Tension
N Shut off the engine. N Wear work gloves to protect your
hands. N The chain must fit snugly against
the underside of the bar and it must still be possible to pull the chain along the bar by hand when the chain brake is released. N If necessary, retension the chain. A new chain has to be retensioned more often than one that has been in use for some time. N Check chain tension frequently see chapter on “Operating Instructions”.

Fuel
This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of highquality gasoline and quality two-stroke air cooled engine oil.
Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel.
Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine.
The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only nationally recognized high-quality unleaded gasoline!
Use only STIHL two-stroke engine oil or equivalent high-quality two-stroke engine oils that are designed for use only in air cooled two-cycle engines.
We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STlHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.).
Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle.
The canister should be kept tightly closed in order to avoid any moisture getting into the mixture.
The machine`s fuel tank and the canister in which fuel mix is stored should be cleaned as necessary.
Fuel mix ages

Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.

Gasoline

Oil (STIHL 50:1 or equivalent high-quality oils)

US gal. 1 2 1/2 5

US fl.oz 2.6 6.4 12.8

Dispose of empty mixing-oil canisters only at authorized disposal locations.

Fueling
Preparations
N Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank.
Always thoroughly shake the mixture in the canister before fueling your machine. N Position the machine so that the
filler cap is facing up. In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure buildup in the tank to release slowly.

001BA159 KN

Opening the cap

English

001BA160 KN

001BA161 KN

N Raise the grip until it is upright.
N Turn the cap counterclockwise (approx. a quarter turn).
N Remove the filler cap. Fueling Take care not to spill fuel while fueling and do not overfill the tank.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English Closing the cap

Change the fuel pick up body

Chain Lubricant

N Fit the cap grip upright marks must line up.
N Turn the cap clockwise as far as stop (approx. a quarter turn).
N Fold the grip flush with the top of the cap.
If the grip does not lie completely flush with the cap and the detent on the grip does not engage the recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps.

001BA163 KN

001BA162 KN

Change the fuel pick up body every year.
N Open the filler cap and drain the fuel tank.
N Use a hook to pull the fuel pickup body out of the tank and take it off the hose.
Do not kink the fuel hose do not use any sharp or pointed tools.
N Push the new pickup body into the hose.
N Place the pickup body in the tank and close the filler cap.

165BA003 KN

For automatic and reliable lubrication of the chain and guide bar use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL Bioplus is recommended.
Biological chain oil must be resistant to aging (e.g. STIHL Bioplus) since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive, clutch and chain. It may even cause the oil pump to seize.
The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant.
Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.
Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Filling Chain Oil Tank
Preparations

for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.

Checking Chain Lubrication

English

001BA158 KN 143BA024 KN

N Thoroughly clean the oil filler cap and the area around it to ensure that no dirt falls into the tank.
N Position the machine so that the filler cap is facing up.
N Open the filler cap.
Filling chain oil tank
N Refill the chain oil tank every time you refuel.
Take care not to spill chain oil while refilling and do not overfill the tank. N Close the filler cap.
There must still be a small amount of oil in the oil tank when the fuel tank is empty.
If the oil level in the tank does not go down, the reason may be a fault in the oil supply system: Check chain lubrication, clean the oilways, contact your dealer
MS 171, MS 181, MS 181 C, MS 211, MS 211 C

The saw chain must always throw off a small amount of oil.
Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be irretrievably damaged within a very short time. Always check chain lubrication and the oil level in the tank before starting work. Every new chain has to be broken in for about 2 to 3 minutes. After breaking in the chain, check chain tension and adjust if necessary see “Checking Chain Tension”.
29

English
Chain Brake

Releasing the chain brake

felling cut. The chain brake will operate only if it has been properly maintained and the hand guard has not been modified in any way.
Check operation of chain brake

Locking chain with chain brake

Before starting work: Run engine at idle speed, engage the chain brake (push hand guard toward bar nose). Accelerate up to full throttle for no more than 3 seconds the chain must not rotate. The hand guard must be free from dirt and move freely.
Chain brake maintenance

143BA011 KN 143BA012 KN

in an emergency
when starting
at idling speed
The chain is stopped and locked when the hand guard is pushed toward the bar nose by the left hand or when brake is activated by inertia in certain kickback situations.

N Pull the hand guard back toward the front handle.
Always disengage chain brake before accelerating engine and before starting cutting work. The only exception to this rule is when you check operation of the chain brake.
High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).
The chain brake is designed to be activated also by the inertia of the front hand guard
if the forces are sufficiently high. The hand guard is accelerated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during a

The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals:

Full-time usage: Part-time usage: Occasional usage:

every 3 months
every 6 months
every 12 months

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Winter Operation

English

Winter shutter (MS 211 only)
At temperatures below +50°F (+10°C): N Squeeze the throttle trigger and
move the Master Control lever to cold start l . N Slide the lock to the rear. N Pull the shroud off to the rear.

533BA002 KN 533BA003 KN 533BA014 KN

1
2
N Use the combination wrench to turn the shutter, next to the spark plug, 45° counterclockwise.
1 Winter operation 2 Summer operation N Refit the shroud and secure it with
the lock. Heated air is now drawn in from around the cylinder and mixed with cold air this helps prevent carburetor icing.
At temperatures above +68°F (+20°C), return the shutter to the summer position. This is necessary to avoid engine running problems and overheating. Fitting the Cover Plate

N Place the cover plate (1) in position and secure it with the screws (2).
N If your saw is very cold, start the engine and run it until it reaches normal operating temperature.
MS 211 only: When the cover plate is fitted, the winter shutter may be in either the winter or summer positions. Move it to the winter position when temperatures drop below +50°F (+10°C).

(Special accessory, not for Easy2Start models)

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Information Before You Start
The four positions of the Master Control lever
STOP
0

Starting / Stopping the Engine
Starting procedure

All models

Only models with easy start system

0
2 3

001BA140 KN 533BA004 KN
533BA005 KN

Stop 0 engine off ignition is switched off
Operating position F engine is running or can start
The throttle trigger interlock and throttle trigger must be pressed simultaneously to adjust the Master Control lever from F ton or l.
Warm start n this position is for starting the warm engine the Master Control lever returns to the operating position when the throttle trigger is squeezed
Cold start l this position is for starting the cold engine

N Prime the fuel system by pressure the fuel pump bulb about five times.
Press the fuel pump bulb a few times more if you are starting for the first time after refilling a dry tank.

N Observe safety precautions.
N Push the hand guard (1) forward the chain is locked.
N Press down the trigger interlock (2) and pull the throttle trigger at the same time, and set the Master Control lever (3): If the engine is cold, set the Master Control lever (3) to l (even if the cold engine stalls when you open the throttle). If the engine is warm (engine has been running for about one minute), set the Master Control lever (3) to n.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

143BA018 KN 143BA019 KN 143BA020 KN

N Place your saw on the ground. Make sure you have a firm footing check that chain is not touching any object or the ground.
Bystanders must be well clear of the general work area of the saw.
N Hold the saw firmly on the ground with your left hand on the front handle your thumb should be under the handle.
N Put your right foot into the rear handle and press down.

Alternative method of starting:
N Hold the rear handle tightly between your legs, just above the knees.
N Hold the front handle firmly with your left hand your thumb should be under the handle.

If engine is new, pull the starter rope several times to prime the fuel system.
Models with stardard starter
N Pull the starter grip slowly with your right hand until you feel it engage and then give it a brisk strong pull and push down the front handle at the same time. Do not pull out the starter rope to full length it might otherwise break.
N Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.
Models with Easy2Start
The Easy2Start stores the energy required to start the saw. For this reason there may be a delay of a few seconds between cranking the engine and it actually starting.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
There are two ways of starting with the Easy2Start:
N Hold the starter grip in your right hand and pull it out slowly and steadily.
or:
N Hold the starter grip in your right hand and give it several short pulls, using only a short length of rope for each pull.
N Push down the handle while cranking. Do not pull out the rope to its full length it might otherwise break.
N Do not let the starter grip snap back. Guide it slowly back into the housing so that the starter rope can rewind properly.

When the engine begins to fire:
0
5
3 4
N Move the Master Control lever (3) to n and continue cranking as soon as the engine runs, immediately blip the throttle trigger (4) the Master Control lever (3) will move to the “run” position F, and the engine will settle down to idling speed. As the chain brake is still engaged, the engine must be returned to idling speed immediately or the engine housing and chain brake might otherwise be damaged.

533BA006 KN 143BA012 KN

N Pull the hand guard back toward the front handle: U. The chain brake is now disengaged your saw is ready for operation.
Always disengage chain brake before accelerating the engine. High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).
N Observe safety precautions.
N Always check operation of chain lubrication before starting work.
Switch off the engine.

N Move the Master Control lever to 0

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

At very low outside temperatures: Warm up the engine.

English
Operating Instructions

As soon as the engine runs: N Blip the throttle trigger to disengage
the starting throttle position. The Master Control lever moves to the normal run position and the engine settles down to idle speed. N Disengage the chain brake by pulling the hand guard back toward the front handle as shown. N Open throttle slightly warm up engine for short period.
If the engine does not start
If you did not move the Master Control lever to warm start n quickly enough after the engine began to fire, the combustion chamber is flooded.
N Squeeze the throttle trigger and move the Master Control lever to cold start l .
N Slide the lock to the rear. N Pull the shroud off to the rear.

533BA002 KN

N Pull off the spark plug boot. N Unscrew and dry off the spark plug. N Move the Master Control lever to 0 N Crank the engine several times with
the starter to clear the combustion chamber. N Refit the spark plug. Connect the spark plug boot and reassemble all other parts. N Set Master Control lever to n even if the engine is cold. N Now start the engine.
If fuel tank has been run completely dry and then refueled
N Machines with easy start system: Press the fuel pump bulb several times.
N Start as described for a cold engine (cold start l)

533BA007 KN

During break-in period
A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.
Do not make the mixture leaner to achieve an apparent increase in power this could damage the engine see “Adjusting the Carburetor”.
Always disengage chain brake before accelerating the engine. Running the engine at high revs with the chain brake engaged (chain locked) will quickly damage the engine and chain drive (clutch, chain brake).
During Operation
Check chain tension frequently
A new chain has to be retensioned more often than one that has been in use for some time.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Chain cold
Tension is correct when the chain fits snugly against the underside of the bar and can still be pulled along the bar by hand. Retension if necessary see “Tensioning the Saw Chain”.
Chain at operating temperature
The chain stretches and begins to sag. The drive links must not come out of the bar groove the chain may otherwise jump off the bar. Retension the chain see “Tensioning the Saw Chain”.
Always slacken off the chain after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.
After long period of full-throttle operation
Allow engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air. This protects engine-mounted components (ignition, carburetor) from thermal overload.
After finishing work
N Slacken off the chain if you have retensioned it at operating temperature during cutting work.
The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

Storing your saw for a short period
Wait for the engine to cool down. To avoid condensation, fill the fuel tank and keep the machine in a dry place, well away from sources of ignition, until you need it again.
Storing for a long period
See chapter on “Storing the Machine”

Taking Care of the Guide Bar
2

143BA026 KN

N Turn the bar over every time you sharpen the chain and every time you replace the chain this helps avoid one-sided wear, especially at the nose and underside of the bar.
N Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3).
N Measure the groove depth with the scale on the filing gauge (special accessory) in the area used most for cutting.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Chain type
Picco Rapid Rapid Rapid

Pitch

Minimum groove depth

3/8″ P

0.20″ (5.0 mm)

1/4″

0.16″

(4.0 mm)

3/8″; 0.325″ 0.24″ (6.0 mm)

0.404″

0.28″ (7.0 mm)

If groove depth is less than specified:

N Replace the guide bar.

The drive link tangs will otherwise scrape along the bottom of the groove the cutters and tie straps will not ride on the bar rails.

Air Filter System
The air filter system can be adapted to suit different operating conditions by installing a choice of filters. Changing the filter is quick and simple.

English
One-piece fabric filter (special accessory)
For damage and extremely cold operating conditions.

533BA008 KN

Fleece mat (MS 171)
Top illustration. One-piece fleece filter with sealing lip (MS 181, MS 211)
Bottom illustration, special accessory on MS 171.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Cleaning the Air Filter

Engine Management

Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult. If there is a noticeable loss of engine power
N Squeeze the throttle trigger and move the Master Control lever to cold start l .
N Slide the lock to the rear. N Remove the shroud upwards to the
rear. N Always replace damaged filters. N Clean away loose dirt from around
the filter.

533BA002 KN 533BA009 KN

N Push the two locking tabs upwards, tilt the air filter towards the rear handle and remove.
To avoid damaging the filter. do not use tools for removing and installing the air filter.
N Blow out the filter with compressed air from the clean air side.
If the filter fabric is caked with dirt or no compressed air is available:
N Wash the filter in a clean, nonflammable solution (e.g. warm soapy water) and then dry.
N Reinstall the air filter.
N Refit the shroud and secure it with the lock.

Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Adjusting the Carburetor
General information
The carburetor comes from the factory with a standard setting. This setting provides an optimum fuel-air mixture under most operating conditions. With this carburetor it is only possible to correct the adjusting screws within fine limits.
Standard setting
N Switch off the engine. N Check the air filter and clean or
replace if necessary. N Check the spark arresting screen
(country-specific) in the muffler and clean or replace if necessary.
HL 3/4 1
LA
N Turn high speed screw (H) counterclockwise as far as stop (no more than 3/4 turn).
N Turn the low speed screw (L) carefully clockwise as far as stop, then turn it back 1 turn.

533BA010 KN

Adjusting idle speed
Engine stops while idling
N Turn the low speed screw (L) carefully clockwise as far as stop, then turn it back 1 turn.
N Turn the idle speed screw (LA) clockwise until the chain begins to run then back it off 2 turns.
Chain runs when engine is idling
N Turn the low speed screw (L) carefully clockwise as far as stop, then turn it back 1 turn.
N Turn the idle speed screw (LA) counterclockwise until the chain begins to run then turn it another 2 turns in the same direction.
If the chain continues moving when the engine is idling, have your saw checked and repaired by your servicing dealer.
Erratic idling behavior, poor acceleration (even though standard setting of low speed screw is correct)
Idle setting is too lean N Idle setting is too lean: Turn the low
speed screw (L) counterclockwise until the engine runs and accelerates smoothly.
It is usually necessary to change the setting of the idle speed screw (LA) after every correction to the low speed screw (L).
Fine tuning for operation at high altitude

English
A slight correction of the setting may be necessary if the engine does not run satisfactorily: N Check the standard setting. N Warm up the engine. N Turn high speed screw (H) slightly
clockwise (leaner) no further than stop.
If the setting is too lean there is a risk of engine damage due to insufficient lubrication and overheating.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Checking the Spark Plug

Rectify problems which have caused fouling of spark plug:
N Too much oil in fuel mix.
N Dirty air filter.
N Unfavorable running conditions, e.g. operating at part load.
Fit a new spark plug after approx. 100 operating hours or earlier if the electrodes are badly eroded.

000BA002 KN 000BA036 TR

Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.
If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug. N Remove spark plug see “Starting /
Stopping the Engine”. N Clean dirty spark plug. N Check electrode gap (A) and
readjust if necessary see “Specifications”. N Use only resistor type spark plugs of the approved range.
40

Warning! To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (2) snugly onto spark plug terminal (1) of the proper size. (Note: If terminal has detachable SAE adapter nut, it must be attached.) A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire.
MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Replacing the Starter Rope Models with Easy2Start and Rewind Spring

English
The rewind spring may pop out and uncoil during this operation take care to avoid risk of injury. Models with Easy2Start

208BA017 KN

7 8

1 1

533BA011 KN

N Slide the shroud lock to the rear and remove the shroud.
N Take out the screws (1).
N Use the combination wrench (2) to ease the hand guard outwards and pry it off the fan housing.
N Pull the fan housing off the crankcase and remove it downwards.

4 3
2
N Use circlip pliers to carefully remove the circlip (2).
N Remove the washer (3), driver (4), spring housing (5) and washer (6).
If suitable circlip pliers are not available, have the starter rope or rewind spring replaced by your servicing dealer. Models with standard starter
7 8
9
N Remove the spring clip (7). N Carefully remove the rope rotor
with washer (8) and pawl (9).

208BA013 KN

208BA012 KN

N Remove the spring clip (7). N Carefully remove the rope rotor
with washer (8) and pawls (9). The rewind spring may pop out and uncoil during this operation take care to avoid risk of injury.
Replacing the starter rope
Models with ElastoStart
10
N Pry the cap (10) out of the grip. N Remove the remaining rope from
the rotor and grip.

208BA014 KN

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Models without ElastoStart and models with Easy2Start

Installing the rope rotor Models with standard starter

135BA036 KN

a
N Thread the new rope through the starter grip and tie a simple overhand knot. Dimension “a” should be about 0.16 in (4 mm) to 0.23 in (7 mm).
N Pull the knot back into the grip. N Refit the cap in the grip.
11 12

7 8
9

208BA013 KN

N Remove the remaining rope from the rotor and grip.
N Thread the new starter rope through the rotor and secure it with a simple overhand knot.
N Thread the other end of the rope through the rope guide bushing (from inside) and the underside of the starter grip and secure it with one of the special knots shown do not wind the rope onto the rotor.

135BA032 LÄ

N Coat rope rotor bearing bore with non-resinous oil.
N Slip the rotor over the starter post turn it back and forth to engage the anchor loop of the rewind spring.
N Refit the pawl (9) in the rotor.
N Fit the washer (8) on the starter post.
N Use a screwdriver or suitable pliers to install the spring clip (7) on the starter post and engage it on the pawl’s peg the spring clip must point clockwise as shown in the illustration.

108BA015 KN

Thread the end of the rope N through the top of the guide
bushing (11) and rope rotor (12) and secure it with a simple overhand knot. N Go to “Installing the Rope Rotor”.
42

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Models with Easy2Start

7 8

N Coat rope rotor bearing bore with non-resinous oil.
N Slip the rotor over the starter post turn it back and forth to engage the anchor loop of the rewind spring.
N Refit the pawls (9) in the rotor.
N Fit the washer (8) on the starter post.
N Use a screwdriver or suitable pliers to install the spring clip (7) on the starter post and engage it on the pawl’s peg the spring clip must point clockwise as shown in the illustration.

208BA017 KN 108BA014 KN

Tensioning the rewind spring
N Make a loop in the starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow.
N Hold the rotor steady. Pull out and straighten the twisted rope.
N Let go of the rotor. N Release the rope slowly so that it
winds onto the rotor. The starter grip must sit firmly in the rope bushing. If the grip droops to one side: Add one more turn on the rope rotor to increase spring tension.
When the starter rope is fully extended it must still be possible to rotate the rotor another half turn. If this is not the case, the spring is overtensioned and could break:

English
N Take one turn of the rope off the rotor.
Models with Easy2Start: N Fit the spring housing, driver and
washer on the starter post. N Use circlip pliers to carefully install
the circlip in the starter post groove.
All versions N Fit the fan housing on the
crankcase. N Fit the shroud and secure it with the
lock.
Replacing a broken rewind spring
N Remove the rope rotor.
The bits of spring must still be under tension and could fly apart when you take them out of the housing. To reduce the risk of injury, wear face protection and work gloves. N Carefully remove the parts of the spring. N Lubricate the new spring with a few drops of non-resinous oil.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

N Place the new spring with frame in position in the fan housing the anchor loop must engage the lug in the housing.
N Apply suitable tools (screwdriver, punch, etc.) to the recesses and push the spring into its seat in the fan housing it slips out of the frame in this process.
N Take the frame out of the fan housing.
N Reinstall the rope rotor, tension the rewind spring, fit the fan housing and secure it in position.

001BA126 KN 001BA121 KN

Storing the Machine
For periods of 3 months or longer
N Drain and clean the fuel tank in a well ventilated area.
N Dispose of fuel properly in accordance with local environmental requirements.
N Run the engine until the carburetor is dry this helps prevent the carburetor diaphragms sticking together.
N Remove the saw chain and guide bar, clean them and spray with corrosion inhibiting oil.
N Thoroughly clean the machine pay special attention to the cylinder fins and air filter.
N If you use a biological chain and bar lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank.
N Store the machine in a dry, high or locked location, out of the reach of children and other unauthorized persons.

Checking and Replacing the Chain Sprocket
N Remove chain sprocket cover, saw chain and guide bar.
N Release chain brake pull hand guard against the front handle
Fit new chain sprocket
after use of two saw chains or earlier
if the wear marks (arrows) are deeper than 0.02 in (0.5 mm) otherwise the service life of the saw chain is reduced use check gauge (special accessory) to test
Using two saw chains in alternation helps preserve the chain sprocket. Use only STIHL original chain sprockets to ensure reliable functioning of the chain brake.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

001BA122 KN 689BA020 KN

Install spur chain sprocket / rim

sprocket

62 1
4
3
62 1
N Use a screwdriver to remove the Eclip (1)
N Remove the washer (2) N Remove rim sprocket (3) N Inspect transport profile on the
clutch drum (4) if there are also heavy signs of wear, also replace the clutch drum N Remove clutch drum or spur chain sprocket (5) including needle cage (6) from the crankshaft with versions with two chain brake systems, press throttle lock beforehand

N Clean crankshaft stub and needle cage and lubricate with STIHL lubricant (special accessory)
N Slide needle cage onto the crankshaft stub
N After refitting, turn the clutch drum and/or spur chain sprocket approx. 1 full turn so that the carrier for the oil pump drive engages
N Refit the rim sprocket cavities toward the outside
N Refit washer and E-clip on the crankshaft

English
Maintaining and Sharpening the Saw Chain
Cutting effortlessly with a correctly sharpened chain
A properly sharpened chain slices through wood effortlessly and requires very little feed pressure. Do not work with a dull or damaged chain as it will increase the physical effort required, produce unsatisfactory results and a higher rate of wear. N Clean the chain. N Check the chain for cracks in the
links and damaged rivets. N Replace any damaged or worn
parts of the chain and match the new parts to the shape and size of the original parts.
It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened and in particular if the depth gauge is set too low there is a risk of increased kickback of the saw, with resulting risk of injury.
3/8

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

The chain pitch (e.g. 3/8″) is marked on the depth gauge end of each cutter.
45

English
Use only special saw chain sharpening files. Other files have the wrong shape and cut. Select file diameter according to chain pitch see table “Sharpening Tools”. You must observe certain angles when resharpening the chain cutter.
A

689BA021 KN

A Sharpening angle B Side plate angle

Chain type
Rapid Micro (RM) Rapid Super (RS) Picco Micro (PM)

Angle (°) AB 30 75 30 60 30 75

Cutter shapes
Micro = Semi-chisel
Super = Full chisel
The specified angles A and B are obtained automatically if the recommended files or sharpening tools and correct settings are used.
The angles must be the same on all cutters. If the angles are uneven: Chain will run roughly, not in a straight line, wear quickly and finally break.

As these requirements can be met only after sufficient and constant practice: N Use a file holder A file holder must be used for manual resharpening (see table “Sharpening Tools”). The correct filing angles are marked on the file holder. For checking angles
Use a STlHL filing gauge (special accessory, see table “Sharpening Tools”). This is a universal tool for checking the filing and side plate angles, depth gauge setting, cutter length and groove depth. It also cleans the guide bar groove and oil inlet holes.

001BA203 KN

689BA025 KN

File correctly
N Select sharpening tools according to chain pitch.
N Clamp the bar in a vise if necessary.
N Lock the chain push hand guard forward.
N To rotate the chain pull hand guard against handle to disengage the chain brake On models with QuickStop Super, also press down the throttle trigger interlock lever.
N Sharpen chain frequently, take away as little metal as possible two or three strokes of the file are usually enough.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

90°

689BA018 KN

If the cutters are not the same length, they will have different heights. This makes the chain run roughly and can cause it to break.
N Find the shortest cutter and then file all other cutters back to the same length. It is best to have this work done in the workshop on an electric grinder.
Depth gauge setting

English

Pitch
inch 1/4 3/8 PMN 3/8 PM, PMMC3 0.325 3/8 0.404

(mm) (6,35) (9,32)

Depth gauge setting (a) mm (inch) 0,65 (0.026) 0,45 (0.018)

(9,32) 0,65 (8,25) 0,65 (9,32) 0,65 (10,26) 0,80

(0.026) (0.026) (0.026) (0.031)

Lowering depth gauges

689BA043 KN

689BA047 KN

689BA023 KN

N Hold the file horizontally (at a right angle to side of guide bar) and file according to the angles marked on the file holder. Rest the file holder on the top plate and depth gauge.
N Always file from the inside to the outside of the cutter.
N The file only sharpens on the forward stroke lift the file off the cutter on the backstroke.
N Avoid touching the tie straps and drive links with the file.
N Rotate the file at regular intervals while filing to avoid one-sided wear.
N Use a piece of hardwood to remove burrs from cutting edge.
N Check angles with the filing gauge.
All cutters must be the same length.

The depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed.
a Specified distance or setting between depth gauge and cutting edge.
This setting may be increased by 0.2 mm (0.008″) for cutting softwood in mild weather season no frost.

The depth gauge setting is reduced when the chain is sharpened. N Use a filing gauge to check the
setting every time you sharpen the chain.
1
N Place a filing gauge (1) that matches the chain pitch on the chain if the depth gauge projects from the filing gauge, the depth gauge has to be lowered.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

The kickback tendency of the saw is increased if the depth gauges are too low.

The other parts of the triplehumped tie strap and humped drive link must not be filed since this may increase the kickback tendency of the saw.

N File down the depth gauge until it is level with the filing gauge.

689BA051 KN

N Place the filing gauge on the chain the highest point of the depth gauge must be level with the filing gauge.

689BA052 KN

N After sharpening, clean the chain thoroughly, remove filings or grinding dust lubricate the chain thoroughly.
N Before a long out-of-service period, clean the chain and store it in a welloiled condition.

PM1, RM2

689BA044 KN

N File the top of the depth gauge parallel to the stamped service marking (see arrow) but do not lower the highest point of the depth gauge in this process.

Rear hump of the tie strap (with service marking) is lowered along with the depth gauge.
RSC3, RMC3, PMC3, PMMC3
The upper part of the humped drive link (with service marking) is lowered along with the depth gauge.

Sharpening Tools (special accessories)

Pitch

Round file ^ Round file

File holder

inch 1/4 3/8 P
0.325 3/8
0.404

(mm) mm (inch) (6,35) 4,0 (5/32) (9,32) 4,0 (5/32) (8,25) 4,8 (3/16) (9,32) 5,2 (13/64) (10,26) 5,5 (7/32)

Part No. 5605 772 4006 5605 772 4006 5605 772 4806 5605 772 5206 5605 772 5506

Part No. 5605 750 4327 5605 750 4327 5605 750 4328 5605 750 4329 5605 750 4330

1) consisting of file holder with round file, flat file and filing gauge

Filing gauge Part No. 1110 893 4000 1110 893 4000 1110 893 4000 1110 893 4000 1106 893 4000

Flat file Part No. 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356 0814 252 3356

Sharpening kit 1) Part No. 5605 007 1027 5605 007 1027 5605 007 1028 5605 007 1029 5605 007 1030

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Maintenance and Care
The following maintenance intervals apply for normal operating conditions only. If your daily working time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical wood, etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly.

English

before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required

Complete machine

Visual inspection (condition, leaks) Clean

Throttle trigger, trigger interlock, choke lever, stop switch, Master Control (depending on version)

Check operation

Chain brake

Check operation Have checked by dealer1)

Check

Pickup body/filter in fuel tank

Clean, replace filter element

Replace

Fuel tank

Clean

Chain oil tank

Clean

Chain lubrication

Check

Inspect, also check sharpness

Saw chain

Check chain tension

Sharpen

Check (wear, damage)

Guide bar

Clean and turn over Deburr

Replace

Chain sprocket

Check

Air filter

Clean Replace

Anti-vibration elements

Check Have replaced by dealer1)

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
The following maintenance intervals apply for normal operating conditions only. If your daily working time is longer or operating conditions are difficult (very dusty work area, resin-rich wood, tropical wood, etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly.

before starting work after finishing work or daily after each refueling stop weekly monthly every 12 months if problem if damaged if required

Cooling inlets

Clean

Cylinder fins

Clean

Carburetor

Check idle adjustment chain must not rotate

Adjusting idle speed

Spark plug

Readjust electrode gap Replace after 100 hours of operation

All accessible screws and nuts (not adjusting screws) 2)

Retighten

Check1) Spark arresting screen in muffler (not all markets)
Clean, replace if necessary1)

Check

Chain catcher

Replace

Safety labels

Replace

1) STIHL recommends that this work be done by a STIHL servicing dealer. 2) Firmly tighten down the cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation.

X X
X X
X
X X

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Main Parts

14 1

17
16 15
#

18 19

20 24

22 25
23

English
1 Shroud lock 2 Carburetor adjusting screws 3 Fuel pump (easy start1)) 4 Shutter (summer / winter operation,
MS 211 only) 5 Chain brake 6 Chain sprocket 7 Chain sprocket cover 8 Chain catcher 9 Chain tensioner (side) 10 Bumper spike 11 Guide bar 12 Oilmatic saw chain 13 Adjusting wheel (quick chain
tensioner) 14 Handle of wingnut1) (quick chain
tensioner) 15 Oil filler cap 16 Muffler 17 Front hand guard 18 Front handle (handlebar) 19 Spark plug boot 20 Starter grip 21 Fuel filler cap 22 Master Control lever 23 Throttle trigger 24 Throttle trigger interlock 25 Rear handle 26 Rear hand guard # Serial number

533BA015 KN

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

1) Depending on model 51

English
Definitions
1 Shroud Twist Lock. Lock for shroud.
2 Carburetor Adjusting Screws. For fine tuning the carburetor.
3 Fuel Pump. Fills carburetor with fuel to simplify starting.
4 Shutter. With summer and winter positions. Carburetor is heated in winter position.
5 Chain Brake. A device to stop the rotation of the chain if activated in a kickback situation by the operator’s hand or by inertia.
6 Chain Sprocket. The toothed wheel that drives the saw chain.
7 Chain Sprocket Cover. Covers the clutch and the sprocket.
8 Chain Catcher. Helps to reduce the risk of operator contact by a chain if it breaks or comes off the bar.
9 Chain Tensioner (lateral). Permits precise adjustment of chain tension.
10 Bumper Spike. Toothed stop for holding saw steady against wood.
11 Guide Bar. Supports and guides the saw chain.

12 Oilomatic Saw Chain. A loop consisting of cutters, tie straps and drive links.
13 Adjusting Wheel of Quick Tensioner. Permits precise adjustment of chain tension.
14 Handle of Wingnut of Quick Tensioner. Must be released to allow chain to be tensioned with adjusting wheel.
15 Oil Filler Cap. For closing the oil tank.
16 Muffler. Reduces engine exhaust noise and directs the exhaust gases.
17 Front Hand Guard. Provides protection against projecting branches and helps prevent left hand from touching the chain if it slips off the handlebar. It also serves as the lever for chain brake activation.
18 Front Handle. Handlebar for the left hand at the front of the saw.
19 Spark Plug Boot. Connects the spark plug with the ignition wire.
20 Starter Grip. The grip of the starter, for starting the engine.
21 Fuel Filler Cap. For closing the fuel tank.

22 Master Control Lever. Lever for choke control, starting throttle, run and stop switch positions.
23 Throttle Trigger. Controls the speed of the engine.
24 Throttle Trigger Interlock. Must be depressed before the throttle trigger can be activated.
25 Rear Handle. The support handle for the right hand, located at or toward the rear of the saw.
26 Rear Hand Guard. Gives added protection to operator’s right hand.
Guide Bar Nose The exposed end of the guide bar. (not illustrated, see chapter “Tensioning the Saw Chain”)
Clutch Couples engine to chain sprocket when engine is accelerated beyond idle speed. (not illustrated)
Anti-Vibration System The anti-vibration system includes a number of buffers designed to reduce the transmission of vibrations created by the engine and cutting attachment to the operator’s hands. (not illustrated)

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Specifications
EPA / CEPA
The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements. Category A = 300 hours B = 125 hours C = 50 hours
CARB
The Emission Compliance Period used on the CARB-Air Index Label indicates the terms: Extended = 300 hours Intermediate = 125 hours Moderate = 50 hours
Shortblock
STIHL single cylinder two-stroke engine

MS 171

Displacement:

1.84 cu. in. (30.1 cm3)

Bore:

1.5 in. (37 mm)

Stroke:

1.1 in. (28 mm)

Engine power to ISO 7293:

1.7 hp (1.3 kW) at 9,500 rpm

Idle speed:

2,800 rpm

Maximum permissible

speed with bar and

chain:

13,500 rpm

MS 181, MS 181 C

Displacement:

1.94 cu. in. (31.8 cm)3

Bore:

1.6 in. (38 mm)

Stroke:

1.1 in. (28 mm)

Engine power to ISO 7293:

2.0 hp (1.5 kW) at 9,500 rpm

Idle speed:

2,800 rpm

Maximum permissible

speed with bar and

chain:

13,500 rpm

MS 211, MS 211 C

Displacement:

2.15 cu. in. (35.2 cm3)

Bore:

1.7 in. (40 mm)

Stroke:

1.1 in. (28 mm)

Engine power to ISO 7293:

2.3 hp (1.7 kW) at 9,500 rpm

Idle speed:

2,800 rpm

Maximum permissible

speed with bar and

chain:

13,500 rpm

Ignition system

English

Electronic magneto ignition (breakerless)

Spark plug (suppressed):
Electrode gap:

NGK CMR6H
0.02 in. (0.5 mm)

Fuel system

All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 9.1 oz (0.27 l)
Chain lubrication

Fully automatic, speed-controlled oil pump with rotary piston Oil tank capacity: 9.0 oz (0.265 l)
Weight

dry, without bar and chain

MS 171:

9.5 lbs. (4.3 kg)

MS 181:

9.5 lbs. (4.3 kg)

MS 181 C:

10.1 lbs. (4.6 kg)

MS 211:

9.5 lbs. (4.3 kg)

MS 211 C:

10.1 lbs. (4.6 kg)

Cutting attachment MS 171

Recommended cutting attachments in compliance with Sec. 5.11 of ANSI standard B 175.1-2000

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

Guide bars

STIHL reduced kickback bar (with green label) for 3/8″ P pitch
Rollomatic Mini 12, 14, 16 in. cutting lengths: (30, 35, 40 cm)
Groove width: 0.043 in. (1.1 mm)

Saw Chains

STIHL reduced kickback bar (with green label) for 3/8″ P pitch

Picco Micro Mini Comfort 3 (61 PMMC3)

Pitch:

3/8″ P (9.32 mm)

Drive link gauge: 0.043 in. (1.1 mm)

Chain sprocket Spur chain sprocket or rim sprocket 6-tooth for 3/8″ P
Cutting attachment MS 181, MS 181 C

Recommended cutting attachments in compliance with Sec. 5.11 of ANSI standard B 175.1-2000

Guide bars

STIHL reduced kickback bar (with green label) for 3/8″ P pitch

Rollomatic cut- 12, 14, 16 in. ting lengths: (30, 35, 40 cm)

Rollomatic E

Light cutting 12, 14, 16 in.

lengths:

(30, 35, 40 cm)

Groove width: 0.050 in. (1.3 mm)

Saw Chains

STIHL reduced kickback bar (with green label) for 3/8″ P pitch

Picco Micro Comfort 3 (63 PMC3)

Pitch:

3/8″ P (9.32 mm)

Drive link gauge: 0.050 in. (1.3 mm)

Chain sprocket

Spur chain sprocket or rim sprocket 6-tooth for 3/8″ P pitch 7-tooth for 3/8″ P pitch

Bar and chain MS 211, MS 211 C

Recommended cutting attachments in compliance with Sec. 5.11 of ANSI standard B 175.1-2000

Guide bars

STIHL reduced kickback bar (with green label) for 3/8″ P pitch

Rollomatic cut- 12, 14, 16 in. ting lengths: (30, 35, 40 cm)

Rollomatic E

Light cutting 12, 14, 16 in.

lengths:

(30, 35, 40 cm)

Groove width: 0.050 in. (1.3 mm)

Saw Chains

STIHL reduced kickback bar (with green label) for 3/8″ P pitch

Picco Micro Comfort 3 (63 PMC3)

Pitch:

3/8″ P (9.32 mm)

Drive link gauge: 0.050 in. (1.3 mm)

Chain sprocket
Spur chain sprocket or rim sprocket 6-tooth for 3/8″ P pitch 7-tooth for 3/8″ P pitch
Cutting attachment MS 171, MS 181, MS 181 C, MS 211, MS 211 C
Observe the information about ANSI standard B 175.1-2000 as well as the definition “low-kickback saw chain” in the section “Safety Instructions”.
In order to comply with the kickback performance requirements of Sec. 5.11 of ANSI standard B 175.1-2000, do not use replacement saw chains unless they have been designated as meeting the ANSI Sec. 5.11 requirements on this specific powerhead, or have been designated as “low kickback” saw chains in accordance with the ANSI B 175.1-2000 standard.
Since new bar/chain combinations may be developed after publication of this Manual, ask your STIHL dealer for the latest STIHL recommendations.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Special Accessories
Contact your STIHL dealer for information regarding special accessories that may be available for your product.

Ordering Spare Parts

English
Maintenance and Repairs

Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make reordering simpler. The guide bar and saw chain are subject to normal wear and tear. When purchasing these parts, always quote the saw model, the part numbers and names of the parts.
Model
Serial number
Guide bar part number

Users of this unit should carry out only the maintenance operations described in this manual. Other repair work may be performed only by authorized STIHL service shops.
Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL servicing dealer using original STIHL replacement parts.
Original STlHL parts can be identified by the STIHL part number, the { logo and, in some cases, by the STIHL parts symbol K. The symbol may appear alone on small parts.

Chain part number
See “Specifications” in this manual for the recommended reduced kickback cutting attachments.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

STIHL Incorporated Federal Emission Control Warranty Statement
Not for California
Your Warranty Rights and Obligations
The U.S. Environmental Protection Agency (EPA) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser.
STIHL Incorporated must warrant the emission control system on your small off-road engine for the period of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road equipment engine.
Your emission control system includes parts such as the carburetor and the ignition system. Also included may be hoses, and connectors and other emission related assemblies.
Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no

cost to you, including diagnosis (if the diagnostic work is performed at an authorized dealer), parts, and labor.
Manufacturer’s Warranty Coverage
In the U.S., 1997 and later model year small off-road equipment engines are warranted for two years. If any emissionrelated part on your engine is defective, the part will be repaired or replaced by STIHL Incorporated free of charge.
Owner’s Warranty Responsibilities
As the small off-road equipment engine owner, you are responsible for the performance of the required maintenance listed in your owner’s manual. STIHL Incorporated recommends that you retain all receipts covering maintenance on your small off-road equipment engine, but STIHL Incorporated cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.
Any replacement part or service that is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of the engine manufacturer.
As the small off-road equipment engine owner, you should be aware, however, that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road equipment engine to a STIHL service center as soon as a

problem exists. The warranty repairs will be completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-4678445 or you can write to
STIHL Inc., 536 Viking Drive, P.O. Box 2015, Virginia Beach, VA 23450-2015
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine will be designed, built and equipped, at the time of sale, to meet all applicable regulations. STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years.
Warranty Period
The warranty period will begin on the date the utility equipment engine is purchased by the initial purchaser and you have signed and sent back the warranty card to STIHL.
If any emission related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner. Any warranted part which is not scheduled for replacement as required maintenance, or which is scheduled only for regular inspection to the effect of “repair or replace as necessary” will be warranted for the

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

warranty period. Any warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that part.
Diagnosis
You, as the owner, shall not be charged for diagnostic labor which leads to the determination that a warranted part is defective. However, if you claim warranty for a component and the machine is tested as non-defective, STIHL Incorporated will charge you for the cost of the emission test. Mechanical diagnostic work will be performed at an authorized STIHL servicing dealer. Emission test may be performed either at STIHL Incorporated or at any independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective.
Any manufacturer-approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts and must be provided without charge to the owner. STIHL Incorporated is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
The following list specifically defines the emission-related warranted parts:

Carburetor
Choke (Cold start enrichment system)
Intake manifold
Air filter
Spark plug
Magneto or electronic ignition system (ignition module)
Catalytic converter (if applicable)
Fasteners
Where to make a claim for Warranty Service
Bring the product to any authorized STIHL servicing dealer and present the signed warranty card.
Maintenance Requirements
The maintenance instructions in this manual are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction “Fuel”). Deviations from this recommendation regarding quality and mixing ratio of fuel and oil may require shorter maintenance intervals.
Limitations
This Emission Control Systems Warranty shall not cover any of the following: N repair or replacement required
because of misuse, neglect or lack of required maintenance, N repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that adversely affect performance and/or durability, and alterations or

English
modifications not recommended or approved in writing by STIHL Incorporated,
and N replacement of parts and other
services and adjustments necessary for required maintenance at and after the first scheduled replacement point.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement
For California only
Your Warranty Rights and Obligations
The California Air Resources Board (CARB) and STIHL Incorporated are pleased to explain the emissions control system’s warranty on your 2007 and later small off-road equipment engine.
In California, new equipment that uses small off-road-engines must be designed, built, and equipped to meet the State’s stringent anti-smog standards. STIHL Incorporated must warrant the emissions control system on your small off-road engine for the period listed below provided there has been no abuse, neglect or improper maintenance of your small off-road engine.
Your emissions control system may include parts such as:
Air filter, Carburetor, Purger, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners.

Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no cost to you including diagnosis, parts and labor.
Manufacturer’s Warranty Responsabilities
This emissions control system is warranted for two years in California. If any emissions-related part on your equipment is defective, the part will be repaired or replaced by STIHL Incorporated free of charge.
Owner’s Warranty Responsabilities
As the small off-road equipment engine owner, you are responsible for performance of the required maintenance listed in your instruction manual. STIHL Incorporated recommends that you retain all receipts covering maintenance on your small offroad equipment engine, but STIHL Incorporated cannot deny warranty solely for the lack of receipts or your failure to ensure the performance of all scheduled maintenance.
As the small off-road equipment engine owner, you should however be aware that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, or improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road equipment engine to a STIHL servicing dealer as soon as the problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days. If

you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-4678445 or you can write to
STIHL Inc., 536 Viking Drive, P.O. Box 2015, Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine is designed, built and equipped, at the time of sale, to meet all applicable emission regulations.
STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform to applicable emission regulations for a period of two years.
Defects Warranty Period
The warranty periods will begin on the date the utility equipment engine is purchased by the initial purchaser. If any emission related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner.
Add on or modified parts that are not exempted by CARB may not be used. The use of any non exempted add on or modified parts will be grounds for disallowing a warranty claim. STIHL Incorporated will not be liable to warrant failures of warranted parts caused by the use of a non exempted add on or modified part.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English

The warranty on emissions-related parts will be interpreted as follows:
1. Any warranted part that is not scheduled for replacement as required maintenance in the written instructions required in the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. If any such part fails during the period of warranty coverage, it must be repaired or replaced by the manufacturer according to Subsection (4) below. Any such part repaired or replaced under the warranty must be warranted for the remaining warranty period.
2. Any warranted part that is scheduled only for regular inspection in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the warranty period defined in Subsection COVERAGE BY STIHL INCORPORATED, see above. A statement in such written instructions to the effect of “repair or replace as necessary” will not reduce the period of warranty coverage. Any such part repaired or replaced under warranty must be warranted for the remaining warranty period.
3. Any warranted part that is scheduled for replacement as required maintenance in the written instructions required by the Emission Warranty Parts List (see below) must be warranted for the period of time prior to the first scheduled replacement point for

that part. If the part fails prior to the first scheduled replacement, the part must be repaired or replaced by the engine manufacturer according to Subsection (4) below. Any such part repaired or replaced under warranty must be warranted for the remainder of the period prior to the first scheduled replacement point for the part.
4. Repair or replacement of any warranted part under the warranty must be performed at a warranty station at no charge to the owner.
5. Notwithstanding the provisions of Subsection (4) above, warranty services or repairs will be provided at all manufacturer distribution centers that are authorized to service the subject engines.
6. The owner must not be charged for diagnostic labor that leads to the determination that a warranted part is in fact defective, provided that such diagnostic work is performed at a warranty station.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective. Any manufacturer approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission related parts and must be provided without charge to the owner. STIHL Incorporated is liable for

damages to other engine components caused by the failure of a warranted part still under warranty.
Emission Warranty Parts List
Air filter, Carburetor, Purger, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings, Clamps, Fasteners
Where to make a claim for Warranty Service
Bring the STIHL product to any authorized STIHL servicing dealer and present the signed STIHL product registration card, or the print-out of the electronic product registration.
Limitations
The repair or replacement of any warranted part otherwise eligible for warranty coverage may be excluded from such warranty coverage if STIHL Incorporated demonstrates that the STIHL product has been abused, neglected, or improperly maintained, and that such abuse, neglect, or improper maintenance was the direct cause of the need for repair or replacement of the part. That notwithstanding, any adjustment of a component that has a factory installed, and properly operating, adjustment limiting device is still eligible for warranty coverage.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

English
Trademarks
STIHL Registered Trademarks
STIHL® { K The color combination orange-grey (U.S. Registrations #2,821,860; #3,010,057, #3,010,058, #3,400,477; and #3,400,476)
4-MIX® AUTOCUT® EASYSTART® FARM BOSS® OILOMATIC® STIHL Cutquik® STIHL DUROMATIC® STIHL Quickstop® STIHL ROLLOMATIC® STIHL WOOD BOSS® TIMBERSPORTS® YARD BOSS®
Some of STIHL’s Common Law Trademarks

BioPlusTM Easy2StartTM EasySpoolTM ElastoStartTM EmaticTM / Stihl-E-MaticTM FixCutTM HT PlusTM IntelliCarbTM Master Control LeverTM MicroTM Pro MarkTM Quad PowerTM Quiet LineTM STIHL ArcticTM STIHL CompactTM STIHL HomeScaper SeriesTM STIHL Interchangeable Attachment SeriesTM STIHL MagnumTM / Stihl-MagnumTM STIHL MiniBossTM STIHL MotoPlus 4TM STIHL Multi-Cut HomeScaper SeriesTM Stihl OutfittersTM STIHL PICCOTM STIHL PolyCutTM STIHL PowerSweepTM STIHL Precision SeriesTM STIHL ProtechTM STIHL RAPIDTM STIHL SuperCutTM

STIHL TerritoryTM
TapActionTM
TrimCutTM
This listing of trademarks is subject to change.
Any unauthorized use of these trademarks without the express written consent of ANDREAS STIHL AG & Co. KG, Waiblingen is strictly prohibited.

MS 171, MS 181, MS 181 C, MS 211, MS 211 C

Contenido

español / EE.UU

Manual de instrucciones original

Las tintas contienen aceites vegetales, el papel es reciclable.

Impreso en papel libre de cloro.

Acerca de este manual de

instrucciones

Medidas de seguridad y técnicas

de manejo

Accesorio de corte

Montaje de la espada y cadena

(tensor lateral de la cadena)

Montaje de la espada y cadena

(tensor rápido de la cadena)

Tensado de la cadena de aserrado

(tensor lateral de la cadena)

Tensado de la cadena de aserrado

(tensor rápido de la cadena)

Revisión de tensión de la cadena 89

Combustible

Llenado de combustible

Lubricante de cadena

Llenado del tanque de aceite de la

cadena

Revisión de lubricación de la

cadena

Freno de la cadena

Manejo durante el invierno

Información previa al arranque

Arranque / parada del motor

Instrucciones para el uso

Cuidado de la espada

100

Sistema de filtro de aire

101

Limpieza del filtro de aire

102

Gestión del motor

102

Ajuste del carburador

103

Revisión de bujías

104

{

Sustitución de la cuerda de

arranque y del resorte de

rebobinado

105

Almacenamiento de la máquina 109

Revisión y sustitución del piñón de

cadena

109

Mantenimiento y afilado de la

cadena de aserrado

110

Información para mantenimiento 114

Componentes importantes

116

Especificaciones

118

Accesorios especiales

120

Pedido de piezas de repuesto

121

Información de reparación

121

Declaración de garantía de STIHL

Incorporated sobre sistemas de

control de emisiones según normas

Federales

121

Declaración de garantía de STIHL

Incorporated sobre el control de

emisiones de gases de escape y

emisiones por evaporación para el

Estado de California

124

Marcas comerciales

126

Permita que solamente las personas que comprenden la materia tratada en este manual manejen su motosierra.
Para obtener el rendimiento y satisfacción máximos de la motosierra STIHL, es importante leer y comprender las precauciones de seguridad y las instrucciones de mantenimiento y las precauciones de seguridad en la sección “Medidas de seguridad y técnicas de manejo”, antes de usar la motosierra. Para información adicional, visite www.stihlusa.com.
Comuníquese con el concesionario o distribuidor de STIHL si no se entiende alguna de las instrucciones dadas en el presente manual.
Advertencia!
Dado que la motosierra es una herramienta para cortar madera que funciona a gran velocidad, es necesario tomar medidas especiales de seguridad igual que con cualquier sierra motorizada, para reducir el riesgo de lesiones.
El uso descuidado o inadecuado puede causar lesiones graves e incluso mortales.
La filosofía de STIHL es mejorar continuamente todos sus productos. Como resultado de ello, periódicamente se pueden introducir cambios de diseño y mejoras. Si las características de funcionamiento o la apariencia de su motosierra difieren

Documents / Resources

STIHL MS Series Gas Powered Chainsaw [pdf] Instruction Manual
MS 171, MS 181, MS 211, MS Series Gas Powered Chainsaw, Gas Powered Chainsaw, Powered Chainsaw, Chainsaw

References

User Manual

STIHL MS Series Gas Powered Chainsaw

Specifications

Safety Precautions and Working Techniques

Mounting the Bar and Chain

Fueling

Maintenance and Care

FAQs

Documents / Resources

References

Leave a comment

Cancel reply