XtremePowerUS 7HP Gasoline Engine

Introduction

This manual provides essential safety warnings, precautions, assembly, operating, inspection, maintenance, and cleaning procedures for the XtremePowerUS 7HP gasoline engine (Models 62027 & 62029). It is crucial to read and understand this manual before operating the engine. Keep this manual for future reference.

For questions, contact customer support at 909.628.0880, Monday-Friday, 9 AM to 3 PM PST.

Important Safety Information

General Safety Warnings

Read all safety warnings and instructions. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury. Save all warnings and instructions for future reference.

The warnings, precautions, and instructions in this manual cannot cover all possible conditions and situations. Common sense and caution are essential and must be supplied by the operator. Read and understand all ASSEMBLY AND OPERATION INSTRUCTIONS before operating. Failure to follow safety rules may result in serious personal injury.

• Gasoline fuel and fumes are flammable and potentially explosive. Use proper fuel storage and handling procedures. ❌ Store fuel or other flammable materials nearby.
• Have multiple ABC class fire extinguishers nearby.
• Operation may create sparks that can start fires around dry vegetation. Contact local fire agencies for fire prevention regulations.
• Set up and use only on a flat, level, well-ventilated surface.
• Wear ANSI-approved safety goggles and heavy-duty work gloves during setup.
• Use only oil and fuel recommended in the "Specifications" section.
• Keep all safety guards in place and in proper working order.

Operating Precautions

Carbon Monoxide Hazard: Using an engine indoors CAN KILL YOU IN MINUTES. Engine exhaust contains carbon monoxide, a colorless, odorless poison. NEVER use inside a home or garage, EVEN IF doors and windows are open. Only use OUTSIDE and far away from windows, doors, and vents.

• ❌ Transport the Engine with the Engine running.
• ❌ Sit or stand on this machine.
• ❌ Tilt the machine while the Engine is running.
• Wear ANSI-approved safety goggles, hearing protection, and heavy-duty work gloves during use.
• Parts, especially exhaust system components, get very hot during use. Stay clear of hot parts.
• ❌ Cover the Engine during operation.

Additional Safety Precautions

• People with pacemakers should consult their physician(s) before use due to potential electromagnetic field interference.
• Use only accessories recommended by XtremePowerUS.
• ❌ Operate in explosive atmospheres (flammable liquids, gases, or dust).
• Stay alert, use common sense, and ❌ operate while tired or under the influence of drugs, alcohol, or medication.
• ❌ Overreach. Maintain proper footing and balance.
• Dress properly. ❌ Wear loose clothing or jewellery. Keep hair, clothing, and gloves away from moving parts.
• Use equipment as intended and in accordance with instructions.
• ❌ Operate with known leaks in the fuel system.
• This product may contain or produce chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
• Clean up fuel or oil spills immediately. Dispose of fluids and cleaning materials according to local, state, or federal regulations. Store oil rags in a ventilated, covered, metal container.
• Before use, check for misalignment, binding, or broken parts. Have damaged equipment serviced before use.
• Use the correct equipment for the application. ❌ Modify the equipment or use it for unintended purposes.
• FIRE HAZARD! ❌ Fill fuel tank while engine is running. ❌ Operate if gasoline has been spilled. Clean spilled gasoline before starting. ❌ Operate near pilot lights or open flames.
• This unit should be installed in a restricted-access area for qualified service personnel only.
• Operation may create sparks. A spark arrestor may be required. Contact local fire agencies for regulations.
• Use only recommended lubricants and fuel.
• WARNING: California Proposition 65 warning regarding cancer and reproductive harm.
• ❌ Smoke or allow ignition sources near the equipment, especially when refueling.
• Before service, maintenance, or cleaning: A. Turn engine switch to "OFF". B. Allow engine to cool. C. Remove spark plug cap.
• Keep all safety guards in place and in proper working order.
• ❌ Alter or adjust sealed parts. Only qualified service technicians may adjust sealed parts.
• Have equipment serviced by a qualified repair person using identical replacement parts. ❌ Attempt service procedures not explained in this manual or if uncertain about your ability.
• ❌ Fill fuel tank to the top. Leave room for fuel expansion.
• Wipe up spilled fuel and allow excess to evaporate before starting. ❌ Start engine while fuel smell lingers.

TO PREVENT SERIOUS INJURY: Operate only with a proper spark arrestor installed. Contact local fire agencies for regulations.

WARNING! ❌ DO NOT INSTALL THIS ENGINE ON A VEHICLE.

WARNING! INSTALL THIS ENGINE ACCORDING TO EQUIPMENT INSTRUCTIONS BEFORE USE.

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Features and Product Information

This XtremePowerUS engine is a 4-stroke, single-cylinder, OHV, forced-air-cooled gasoline engine. It features an advanced design, compact structure, reliable performance, convenient service, low fuel consumption, and easy speed adjustment. It is widely used in applications such as generating sets, tours, open work, public entertainment, construction machinery, and agricultural machinery. Key components like the cylinder cover and crankcase are made from aluminum alloy. Advanced manufacturing technologies ensure high accuracy and surface finish. The engine incorporates an auto-press reducing system and centrifugal fly hammer regulating system for smooth and reliable operation and easy starting. A lubricant film-sensing protection system helps prevent damage from poor lubrication.

This manual provides information on operation and maintenance. All materials and diagrams are current as of the publishing time but may differ slightly due to revisions. Copyright belongs to the company; unauthorized reproduction is forbidden. The manual is subject to change without notice.

Operation

Pre-Operation Inspection

Engine Oil

Engine oil is critical for performance and longevity. Do not use engine oil with additives or 2-stroke gasoline oil.

1. Before adding fuel, ensure the engine is on a level, flat surface.
2. Recommended engine oil: SAE 10W-30. Select lubricant based on regional temperatures and our recommendations.
3. Clean the Dipstick and surrounding area. Remove the Dipstick and wipe it with a clean, lint-free rag.
4. Reinsert the Dipstick without threading it in, then remove to check the oil level. The level should be up to the "Full" mark.
5. If the oil level is at or below the "Low" mark, add the appropriate oil until it reaches the proper level. SAE 10W-30 is recommended for general use.
6. Thread the dipstick back in clockwise.

NOTICE: ❌ DO NOT run the engine with too little oil. The engine will shut off if the oil level is too low.

Oil in the Reduction Gear Box (if equipped)

For models with a 1/2 Reduction gearbox and auto-centrifugal clutch:

1. Before adding fuel, ensure the engine is on a level, flat surface. Remove and clean the dipstick.
2. Reinsert the dipstick without screwing it in, then remove to check the oil level.
3. If the oil level is too low, add recommended engine oil until it reaches the upper level mark. Use the same brand as the engine oil. Oil capacity: 0.50 liters.

Starting the Engine

For Rope Handle Starter:

1. Push the fuel switch to "ON".
2. Push the choke lever to "OFF".
3. Move the throttle lever slightly.
4. Push the engine switch to "ON". Pull the starting rope handle up until you feel resistance (anti-action), then give a rapid pull. Release the handle slowly, controlling its recoil. ❌ Releasing the handle suddenly may cause it to hit the engine.

For Electric Starter:

1. Push the engine switch to "START" and hold until the engine starts.

CAUTION: Use the engine switch for no more than 5 seconds at a time to avoid engine damage. Wait 10 seconds between attempts. Once the engine starts, reset the switch to "ON".

Preheating:

1. Preheat the engine and push the choke lever to "ON".
2. Set the throttle lever to the proper position to ensure the engine runs at the required velocity.

Engine Oil Alarm

The engine oil alarm alerts the user to insufficient oil in the crankcase. Running with insufficient oil can damage the engine. The alarm will automatically stall the engine if the oil level is too low, even if the engine switch is still "ON".

CAUTION: If the engine fails to start, check the engine oil level first.

Breaker (Electric Start)

The breaker protects the battery charging circuit. It disconnects during a short circuit or incorrect battery polarity. A green indicator lights up when the circuit is off. Find and resolve the cause, then press the button to reset the breaker.

High Altitude Operation

At higher elevations, the standard fuel mixture ratio may be too rich, impairing performance and increasing fuel consumption. This can be corrected by replacing the main jet with a smaller one and adjusting the idle screw. For continuous use above 1830 meters, consult your dealer. Engine power decreases by approximately 3.5% for every 305 meters increase in altitude.

CAUTION: Using an engine with a high-altitude jet at low altitudes can cause damage due to a lean mixture, resulting in overheating.

Stopping the Engine

1. Push the throttle lever down to the bottom.
2. Push the engine switch to "OFF".
3. Set the fuel switch to "OFF".

Exhaust Control System

Engine operation produces carbon monoxide, nitrogen oxides, and hydrocarbons. The company aims to reduce emissions by using specific carburetors and other devices. Periodic maintenance according to the schedule is necessary. More frequent maintenance may be required under heavy load, dusty, wet, or high-temperature conditions. Use XtremePowerUS or equivalent quality replacement parts to maintain exhaust system effectiveness.

Maintenance

Modifying the exhaust control system can lead to exceeding statutory emission limits. Illegal modifications include altering air inlet/outlet systems or speed-adjusting devices.

Problems Affecting Exhaust Emissions

• Difficult starting or stopping.
• Unstable idling.
• Black smoke or excessive fuel consumption.
• Poor ignition sparks or sparks returning.
• Ignition timing too advanced.

Maintenance Schedule

* Service more frequently when used in dusty areas.

** These items should be serviced by a qualified technician.

For Paper Core Air Cleaners

If the engine fails to work, check the engine oil level first before other checks.

Replacement of Engine Oil

Draining oil while the engine is still hot helps it drain rapidly and entirely.

1. Turn off the oil filler cap and drain plug to drain engine oil thoroughly. Reinstall the drain plug securely.
2. Fill with specified engine oil to the upper level mark.
3. Reinstall the oil filler cap.

Engine oil capacity of the crankcase is 0.6 liters.

Engine oil capacity of the 1/2 reduction gearbox is 0.5 liters.

Engine oil capacity of the 1/6 reduction gearbox is 0.15 liters.

Service of Air Cleaner

A dirty air cleaner restricts airflow to the carburetor. Service periodically, or more often in dusty areas.

CAUTION: Never clean the air cleaner core in gasoline or low flash-point detergents due to explosion risk. Never run the engine without an air cleaner, as dirt and dust can enter and wear the engine.

1. Remove the air cleaner cap and separate the filter. Check for wear or damage; replace if necessary.
2. Clean with home detergents and warm water (or non-flammable cleaning solvents) and dry.
3. Soak in clean engine oil until saturated. Squeeze out excess oil to prevent smoke during startup.
4. Empty the oil in the air cleaner. Use non-flammable or high flash-point cleaning solvents to clean the dusty parts, then dry the air cleaner box.
5. Install the air cleaner filter and cover.
6. Washing of Deposit Cup: Set fuel switch to "OFF", remove deposit cup and O-ring. Wash in non-flammable or high flash-point solvents, dry, and reinstall. Set fuel switch to "ON" and check for leaks. Ensure the area around the engine is dry.

Spark Plug

Spark plug type: F6TC or BPR6ES (NGK). Proper clearance and cleanliness ensure normal engine running.

1. Remove the spark plug using a spark plug wrench. Be careful not to touch the muffler during or immediately after engine operation.
2. Clean the spark plug with a steel brush. Replace if the insulator is damaged.
3. Measure spark plug clearance with a feeler gauge. Clearance should be 0.7~0.8mm. Adjust by carefully bending the side electrode.
4. Check spark plug gasket condition; replace if necessary.
5. Screw the spark plug in by hand until snug, then tighten with a spark plug wrench. For a new plug, twist 1/2 turn after gasket contact. For a used plug, twist 1/8~1/4 turn.

The spark plug must be tightened securely to prevent overheating and engine damage. Use only recommended spark plugs. Incorrect heat range can damage the engine.

Muffler and Spark Eliminator

The muffler is very hot during and after operation. Allow the engine to cool before servicing.

1. Unscrew two M4 nuts and remove the exhaust elbow.
2. Turn off four M5 screws and remove the muffler guard.
3. Turn off screw M4 from the spark eliminator and separate it from the muffler.
4. Clean carbon deposit from the spark eliminator mesh with a brush.
5. Reinstall the spark eliminator in reverse order, being careful not to damage the mesh.

Adjustment of Carburetor Idling

Start and preheat the engine to normal working temperature. Adjust the throttle fixing screw to achieve standard idling speed of 1500±100rpm.

Transport, Storage and Removal from Storage

• Transport with the fuel switch OFF. Transport or store the engine when cool to avoid burns or fire.
• For long-term storage, ensure the area is dry and dust-free. Transfer fuel from the tank and carburetor to a proper container.
• Replace the engine oil.
• Disconnect the spark plug. Fill a spoon of fresh engine oil into the cylinder via the spark plug hole. Rotate the engine to distribute oil evenly, then reinstall the spark plug.
• Pull the starting rope slowly until slight resistance is felt, then keep pulling to align the starting sleeve arrow with the starter hole. This closes the valves to prevent internal rusting.
• For electric starters: disconnect the battery and store in a dry, cool area. Charge monthly.
• Cover the engine to keep dust away.

Troubleshooting

This section provides common problems, their possible causes, and probable solutions.

Important Notes:

• When testing the spark plug, never hold the high-voltage wire with a wet hand.
• Ensure no fuel is spilled outside the engine and the spark plug is not dipped with fuel.
• To prevent fire, keep sparks away from the spark plug mount hole.
• For any problems, contact the authorized dealer for assistance.

Specifications

Technical data vary with type of engine; therefore, they are subject to change without notice.

Data in <> are suitable for engine which is equipped with reducer.

Timing of Distribution

Intake valve opening: BTDC10°

Intake valve closing: ABDC20°

Exhaust valve closing: ATDC10°

Exhaust valve opening: BBDC30°

Parts List

The following sections detail the components of the engine. Each section includes an exploded view diagram and a list of parts with their IDs, part numbers, descriptions, and quantities.

Crankcase Assembly

Crankcase Cover Assembly

Cylinder Head and Head Cover Assembly

Crankshaft, Piston, Connecting & Balancing Shaft

Combination of Cam Shaft & Valve Rocker

Carburetor Assembly

Fuel Tank Assembly

Air Cleaner Assembly

Muffler

Recoil Starter

Regulating Control System

Flywheel

Ignition Coil

Starting Motor Assembly

Starting Motor Control Box Assembly

Electric Diagram

Warranty

PLEASE READ THE FOLLOWING CAREFULLY

The manufacturer and/or distributor provides the parts list and assembly diagram as a reference tool only. They make no representation or warranty regarding the buyer's qualification to make repairs or replace parts. All repairs and parts replacements should be undertaken by certified and licensed technicians, not the buyer. The buyer assumes all risk and liability for repairs or installation.

Record Product's Serial Number Here: _________________________

Note: If no serial number, record month and year of purchase.

Note: Some parts are listed for illustration purposes only and are not available individually.

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❓ Questions, problems, missing parts?

Before returning to your retailer, contact customer service:

? Tel: 909 628 0880

Hour: 9am To 3pm PST (Monday to Friday)

✉️ Email: customer@xtremepowerusa.com

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