Part III Maintenance
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the clearance is small).
5.
Impact the gasket tightly with the socket spanner of spark plug.
When re-installing a used spark plug, screw 1/8-1/4 circle
more after the gasket is impacted. When installing new spark
plug, screw 1/2 circle more after the gasket is impacted.
Note
Too loose spark plug may be overheat and damage the engine. Fastening too tight may cause the
spark plug mounting thread disorder inside the engine.
6. Install the spark plug cap onto the spark plug.
3-5 Adjustment of valve clearance
Valve clearance inspection and adjustment must be done
with the engine cold.
1. Remove the cylinder head cover, and set the
piston at top dead center of the compression
stroke (both valves will be fully closed).
2. Measure the clearance between the rocker
arm and the valve stem with a feeler gauge.
Intake: 0.10~0.15 mm
Exhaust: 0.10~0.15 mm
3. To adjust valve clearance, hold the rocker arm
pivot and loosen the pivot lock nut.
4. Turn the rocker arm pivot to obtain the
specified clearance.
5. Hold the rocker arm pivot and tighten the pivot
lock nut.
6. Recheck the clearance and readjust if necessary.
7. Install the cylinder head cover.
3-6
Adjustment of idle speed
Idle speed
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