Do not overlap the valve. Turn the lapping tool evenly with a downward force of 40~50N.
Do not contaminate push rod and valve pipe with lapping compound.
Thermostat
1. Remove thermostat cover and thermostat.
2. Suspend thermostat in the container with water.
3. Heat the container.
4. Inspect valve lift situation in the prescribed water temperature. If out of specification, replace.
Water temperature The lift height
58～62℃ 0.05mm valve lift
Over 70℃ Over 3mm
5. Install thermostat and thermostat cover. Tighten the bolts to specified torque.
CRANKCASE
Disassembling
1. Remove the bolts according to the reverse numbering sequence of the crankcase cover .
2. Remove the cover of crankcase.
3. Remove the camshaft and valve lifter.
4. Remove the connecting rod bolt and connecting rod cap, and remove connecting rod and piston
assembly.
5. Use clipper to remove circlip, and remove piston pin and piston.
6. Remove crankcase and crankcase gasket.
7. Remove oil splasher gear assembly.
8. Remove breather cover bolts, and remove breather cover.
9. Remove valve bolts and remove valve.
10. Remove oil seal shell bolts, and remove oil seal shell and oil seal.
Breather
1. Inspect breather flap valve, if damaged/cranked/cracked, replace.
2. Inspect breather hole. If clogged, clean.
53
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