CRANKSHAFT
CRANKSHAFT RUNOUT
Support crankshaft by”V”blocks
○
2
,with the dial gauge
○
3
rigged to read the runout as shown.
Service limit
0.05mm
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.
CON-ROD DEFLECTION
Wear on the big end of the connecting rod can be estimated
by checking the movement of the small end of the rod.this
method can also check the extent of wear on the parts of the
connecting rod,crank pin and crank pin bearing should all be
replaced.
Service limit
3.0mm
CON-ROD SMALL END BORE I.D.
Using a caliper gauge,measure the con-rod small end diameter.
Service limit
14.040mm
AUTOMATIC CLUTCH INSPECTION
The engine is equipped with an automatic clutch and variable ratio belt drive transmission.the
engagement of the clutchs governed by enging RPMs and a centrifugal mechanism located in the
clutch.
To insure proper performance and longevity of the clutch assembly it is essential that the clutch
engages smoothly and gradually.two inspection checks must be performed to thoroughlt check the
operation of the drivetrain.follow the procedures listed.
A .INITIAL ENGAGEMENT INSPECTION
●
Warm the motorcycle up to normal operating temperature.
●
Connect an electric tachometer to the engine.
●
Seated on the motorcycle with the motorcycle on level ground,increase the engine RPMs slowly
and note the RPM at which the motorcycle begins to move forward.
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