ECHO SRM-230 SRM-231 Series Service Data

Reference No. 10-22E-00

Issued: 200304

INTRODUCTION

KIORITZ CORPORATION is constantly working on technical improvement of its products. For this reason, technical data, equipment, and design are subject to change without notice. All specifications and directions in this SERVICE DATA are based on the latest product information available at the time of publication.

SERVICE INFORMATION
1. Specification
2. Technical data
3. Torque limits
4. Special repairing materials
5. Service limits

1-1 Specifications

Model	SRM-230	SRM-230S	SRM-230U	SRM-231	SRM-231S	SRM-231U
Dimensions* Length mm(in)
	1795 (70.7)	1795 (70.7)	1795 (70.7)	1795 (70.7)	1795 (70.7)	1795 (70.7)
Width mm(in)
	250 (9.8)	250 (9.8)	700 (27.7)	250 (9.8)	250 (9.8)	700 (27.7)
Height mm(in)
	250 (9.8)	250 (9.8)	455 (17.9)	250 (9.8)	250 (9.8)	455 (17.9)
Dry weight* kg(lb)
	5.1 (11.2)	4.9 (10.8)	5.7 (12.6)	5.1 (11.2)	4.9 (10.8)	5.7 (12.6)
Engine Type
	KIORITZ, air-cooled, two-stroke, single cylinder
Rotation
	Counterclockwise as viewed from the output end
Displacement cm³(in³)
	22.8 (1.39)	22.8 (1.39)	22.8 (1.39)	32.2 (1.27)	32.2 (1.27)	32.2 (1.27)
Bore mm(in)
	28.0 (1.10)	28.0 (1.10)	28.0 (1.10)	28.0 (1.10)	28.0 (1.10)	28.0 (1.10)
Stroke mm(in)
	32.2 (1.27)	32.2 (1.27)	32.2 (1.27)	32.2 (1.27)	32.2 (1.27)	32.2 (1.27)
Compression ratio
	7.1	7.1	7.1	7.1	7.1	7.1
Carburetor Type
	Diaphragm, horizontal-draught, with primer(purge pump)
Model	ZAMA RB-K66B
Ignition Type
	CDI (Capacitor discharge ignition) system
Spark plug	Variable Slope Timing (VST) : Slope advance ignition system combined with electronic speed governor
	BPM8Y
Exhaust Muffler type
	SRM-230, SRM-230S, SRM-230U : Spark arrestor muffler			SRM-231, SRM-231S, SRM-231U : Spark arrestor muffler with catalyst
Starter Type
	Automatic rewind
Rope diameter x length mm(in)	3.5 x 850 (9/ 64 x 33 1/2)
Fuel Type
	Premixed two-stroke fuel (Refer to Operator's manual.)
Two-stroke engine oil	ISO-L-EGD (ISO/CD13738) and J.A.S.O. FC Standards**
Tank capacity L (U.S.fl.oz.)	0.58 (19.6)
Clutch Type
	Centrifugal, 2-shoe pivot
Handle Type
Front	Crescent loop with cushion grip
Rear	U-shaped Integrated control grip with cushion
Drive shaft Type
	Flexible	Solid	Flexible	Flexible	Solid	Flexible
Diameter - Length mm(in)
	6.35 - 1522 (1/4 - 59.9)	7.0 - 1550 (0.31 - 61.0)	6.35 - 1522 (1/4 - 59.9)	6.35 - 1522 (1/4 - 59.9)	7.0 - 1550 (0.31 - 61.0)	6.35 - 1522 (1/4 - 59.9)
Housing (Main pipe)	OD - ID mm 25 - 22
Housing (Main pipe)	(in) (0.98 - 7/8)
Length mm(in)	1500 (59.1)	1500 (59.1)	1500 (59.1)	1500 (59.1)	1500 (59.1)	1500 (59.1)
Gear case Reduction ratio
	1.4
Gear tooth	Spiral bevel gear
Lubrication	Lithium based grease or ECHO LUBETM
Cutter Type
	Nylon line cutter, 8-tooth blade†, 22-tooth bladet, Others
Pilot diameter mm(in)	20.0 (0.79) Option
Fastener type, size mm	Left-hand thread nut, M10 x 1.25 pitch
Cutting rotation	Counterclockwise as viewed from top

* OD: Outer diameter. ID: Inner diameter.

** Without shoulder harness and Nylon line head. † Refer to Operator's manual. ‡ Install and use U-shaped handle and metal blade kit when operating any model with blade.

1-2 Technical data

Description	Unit	Value
Engine
Idling speed	r/min	2400 - 3200
Wide open throttle speed	r/min	8500
Engine speed at beginning of clutch engagement	r/min	3300 - 4100
Compression pressure	MPa (kgf/cm²) (psi)	0.9 (9.0) (125)
Ignition system
Spark plug gap	mm (in)	0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1500 r/min	kV	13
Secondary coil resistance	kΩ	2.4 - 3.2
Pole shoe air gaps	mm(in)	0.30 - 0.40 (0.012 - 0.016)
Ignition timing	at 1000r/min °BTDC	16.5
	at 3000r/min °BTDC	25.0
	at 8500r/min °BTDC	33.0
	at 11000r/min °BTDC	13.0
Carburetor
Venturi Size	mm(in)	9.0 (0.354)
Throttle Bore	mm(in)	9.0 (0.354)
Main jet		#35
Test Pressure, minimum	MPa (kgf/cm²) (psi)	0.05 (0.5) (7.0)
Metering lever height	mm(in)	0.1 - 0.25 (0.004-0.01) lower than diaphragm seat

BTDC: Before top dead center.

1-3 Torque limits

Descriptions	Size	kgf·cm	N·M	in·lbf
Starter system
Starter pawl assembly	M8	80 - 100	8 - 10	70 - 90
Starter case	4* 14	-281.4	-2.8	12 - 25
Ignition system
Flywheel	M8	160 - 200	16 - 20	140 - 175
Ignition coil	M 5*	40 - 60	4 - 6	35 - 50
Fan cover	M 5*	30 - 45	3.0 - 4.5	25 - 40
Spark plug	M 14	150 - 170	15 - 17	130 - 150
Fuel system
Carburetor	M5	26 - 37	2.6 - 3.7	22 - 32
Intake insulator	M5	50 - 70	5 - 7	43 - 60
Fuel tank	M 5*	30 - 45	3.0 - 4.5	25 - 40
Clutch
Clutch shoe	M6	70 - 110	7 - 11	60 - 95
Engine
Crankcase	M5	70 - 110	7 - 11	60 - 95
Cylinder	M5	70 - 110	7 - 11	60 - 95
Muffler
Muffler	M 5*	90 - 110	9 - 11	80 - 95
Exhaust guide	M4	12 - 18	1.2 - 1.8	10 - 15
Other Stand
Muffler cover	M 5*	20 - 35	2.0 - 3.5	17 - 30
Top guard	M 5*	30 - 45	3.0 - 4.5	25 - 40
Starter side	M 5*	20 - 30	2 - 3	17 - 25
Fan case side	M 5*	30 - 45	3.0 - 4.5	25 - 40
Cutter
fastener	LM 10	280 - 320	28 - 32	245 - 280
Regular bolt, nut, and screw	M3	6 - 10	0.6 - 1.0	5 - 9
	M4	15 - 25	1.5 - 2.5	13 - 22
	M5	25 - 45	2.5 - 4.5	22 - 40
	M6	45 - 75	4.5 - 7.5	40 - 65
	M8	110 - 150	11 - 15	95 - 130

*Apply thread locking sealant. (See below)

1-4 Special repairing materials

Material	Location	Remarks
Grease	Drive shaft Gear case Rewind spring Starter center post Oil seal inner lips	Lithium based grease or ECHO LUBETM
Thread locking sealant	Starter case Fuel tank Ignition coil Fan cover Top guard Stand Muffler cover Muffler	Loctite #648 or equivalent Loctite #222, Three Bond #1342 or equivalent Loctite #242, ThreeBond #1327 or equivalent

1-5 Service Limits

Description		mm (in)
Cylinder bore		When plating is worn and aluminum can be seen
Piston outer diameter	Min.	32.13 (1.265)
Piston pin bore	Max.	8.030 (0.3161)
Piston ring groove	Max.	1.55 (0.061)
Piston ring side clearance	Max.	0.1 (0.004)
Piston pin outer diameter	Min.	7.97 (0.3138)
Piston ring width	Min.	1.45 (0.057)
Piston ring end gap	Max.	0.5 (0.02)
Con-rod small end bore	Max.	12.0 (0.472)
Crankshaft runout	Max.	0.05 (0.002)
Clutch drum bore	Max.	59.5 (2.34)

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