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I. PARTS DESCRIPTION.......................................................................................................................................................1
1-1 Part description .........................................................................................................................................................1
1-1-1 Feature...........................................................................................................................................................1
1-1-2 Model & serial number..................................................................................................................................1
1-2 Specification .............................................................................................................................................................2
1-3 Service limit..............................................................................................................................................................3
II. DIMENSION AND TORQUE...........................................................................................................................................4
2-1 Engine dimension .....................................................................................................................................................4
2-1-1 Appearance dimension...................................................................................................................................4
2-1-2 Installation hole position ...............................................................................................................................5
2-1-3 P.T.O dimension figure ..................................................................................................................................5
2-2 Torque value .............................................................................................................................................................6
2-3 Standard torque value ...............................................................................................................................................7
2-4 Important bolt torque value.......................................................................................................................................7
III. MAINTENANCE .............................................................................................................................................................8
3-1. Maintenance schedule..............................................................................................................................................8
3-2 Change oil.................................................................................................................................................................9
3-3 AIR CLEANER......................................................................................................................................................10
3-4 Fuel parts ................................................................................................................................................................10
3-4-1 Strainer clean...............................................................................................................................................10
3-4-2 Fuel check.................................................................................................................................................... 11
3-5 Spark Plug Service..................................................................................................................................................12
3-6 Valve clearance adjustment.....................................................................................................................................13
3-7 Governor adjusting .................................................................................................................................................14
IV. DISASSEMBLING AND SERVICING.........................................................................................................................16
4-1 Troubleshooting......................................................................................................................................................16
4-1-1 Starting difficult...........................................................................................................................................16
4-1-2 Power lack ...................................................................................................................................................17
4-1-3 Speed unstable.............................................................................................................................................18
4-1-4 Unable igniting ............................................................................................................................................19
4-1-5 Engine overheat...........................................................................................................................................19
4-1-6 Abnormal sound ..........................................................................................................................................20
4-1-7 Exhaust gas color abnormal.........................................................................................................................20
4-2 Preparation of servicing..........................................................................................................................................21
4-2-1 Safety precautions .......................................................................................................................................21
4-2-2 Special tools..............................................................................................................................................21
4-3 Engine.....................................................................................................................................................................22
4-3-1 Recoil starter /housing.................................................................................................................................22
4-3-2 Fuel tank......................................................................................................................................................23
4-3-3 Ignition coil/flywheel ..................................................................................................................................24
4-3-4 Muffler.........................................................................................................................................................26
4-3-5 Air cleaner ...................................................................................................................................................27
4-3-6 Carburetor....................................................................................................................................................28
4-3-7 Throttle control............................................................................................................................................32
4-3-8 Cylinder head/valve train.............................................................................................................................33
4-3-9 Crankcase cover/governor gear ...................................................................................................................38
4-4-10 Crankshaft/piston/crankcase......................................................................................................................39
4-5 Electric diagram......................................................................................................................................................46