Part III Maintenance
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3-5 Maintenance of spark plug
Recommended spark-plug types: RC12YC or equivalent
spark plugs.
The replacement of spark plug has the following
advantages:
Guarantee the continuous spark; start with more
reliability; better fuel conservation
Note
The use of spark plug with incorrect models and
heat values may reduce the engine performance or
damage the engine.
1. Take off the spark plug cap and remove dusts around
the spark plug.
2. Dismantle the spark plug with socket wrench for spark plug.
3. Check if the electrode of the spark plug is excessive worn,
and if the insulator is cracked or if there is too much carbon
deposition.
If it can be continuously used, use the steel wire brush to
remove impurities such as carbon deposition.
4. Measure the electrode clearance of the spark plug with a
feeler gauge and the correct clearance shall be 0.7 ~ 0.8 mm.
If it requires adjustment, slightly tap (when the clearance
is huge) or pry the electrode with a slotted screwdriver (when
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
0.7-0.8 mm
Side
electrode
Steel wire brush
Spark
plug cap
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