The normal insulator tip is gray, tan or light brown. There will be few
Combustion deposits. The electrodes are not burned or eroded. This
indicates the proper type and heat range for the engine and the service.
lip: The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect throttle body
The wet fouled insulator tip is black. A damp oil film covers the firing end.
There may be a carbon layer over the entire nose. Generally, the electrodes
are not worn. General causes of fouling are excessive oil, use of
non-recommended oil, improper use of the choke, or incorrect throttle
body/carburetor adjustments.
Spark Plug Removal and Replacement
1. Remove the spark plug cap.
2. Using the spark plug wrench
provided in the tool kit, remove
the plug by rotating it counter-
3. Reverse the procedure for spark plug
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