Yamaha VMX12H, Supplementary Service Manual

Page: 88 / 405

VALVE CLEARANCE ADJUSTMENT
8.
Remove:
*Crankcase cover plate
*Special washer
plug
NOTE:
Check for clog of oil passage in the bolt.
If any, clean the oil passage.
Inspection and Adjustment
1. Measure:
*Valve clearance
NOTE:
Be sure piston is at Top Dead Center
when measuring clearance.
By the following measurement steps.
Valve clearance measurement steps:
*Turn the crankshaft counterclockwise with a
32
mm
(1.26 in) socket wrench
.
NOTE:
Valve clearance must be measured when the
engine is cool to the touch.
*Align the
"
mark (for the No. 1cylinder)
on the flywheel with the stationary pointer
on the crankcase cover. When the
mark is aligned with the stationary pointer
,
the piston
is
a t top dead center TDC.
*Note marks on flywheel to obtain correct
valve clearance measurements.
TDC for No. 1 cylinder
TDC for No. 2 cylinder
the valve clearance using a Feeler
Record the measured amount ifthe clearance
.
is incorrect.
Intake Valve (cold):
0.11
-
0.15 mm
(0.004
-
0.006 in)
Exhaust Valve (cold):
0.26 0.30 mm)
(0.010
0.012 in)
5