Chapter III Maintenance
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3-7 Adjustment of valve clearance
The check and adjustment of valve
clearance must be conducted when the engine is cold.
1) Take apart the cylinder-head cover, pull the
starting handle until you feel the obvious resistance
to make the piston reach nearby upper dean center
of compression stroke. At this time, both inlet and
exhaust valves are in the closed status.
2) Insert the thickness gauge into the clearance
between the rocker arm and valve to measure the
valve clearance.
3) Operate as per the following steps if the adjustment
is required:
a) Fix the valve-adjusting screw with a clamp
and unscrew the valve lock nut with a spanner.
b) Rotate the valve-adjusting screw and adjust it
to the specified valve clearance.
c) Fix the valve-adjusting screw with a clamp
and fasten the valve lock nut.
d) Re-check the valve clearance after fastening
the lock nut.
To increase valve clearance, screw out the pivot
To decrease valve clearance, screw in the pivot
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