OIL SEAL
Damage to the lip of the oil seal may result in leakage of the fuel-air mixture or oil. Inspect for damage and be sure to replace the
damaged seal if found.
CRANKSHAFT
CRANKSHAFT RUNOUT
Support crankshaft by“V” block, with the dial gauge rigged
to read the runout as shown.
Service limit：
：：
：0.05mm(0.002in)
Excessive crankshaft runout is often responsible for
abnormal engine vibration. Such vibration shortens engine
life.
Condition of big end bearing
Turn the crankshaft with the connecting rod to feel the smoothness of
rotary motion in the big end. Move the rod up and down while holding
the crankshaft rigidly to be sure that there is no rattle in the big end.
Wear on the big end of the connecting rod can be estimated by
checking the movement of the small end of the rod. The method can
also check the extent of wear on the parts of the connecting rod ‘s big
end. If wear exceeds the limit, replace connecting rod, crank pin
and crank pin bearing.
Service limit：
：：
：3.0mm(0.12in)
Connecting rod small end inside diameter
Measure the connecting rod small end diameter with a
caliper gauge.
Service limit：14.040mm
Automatic clutch inspection
The scooter is equipped with an automatic clutch
and variable ratio belt drive transmission. The
engagement of the clutch is governed by engine RMPS
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