Spark Plugs
Normal Spark Plug
The normal insulator tip is gray, tan or light brown. There will be few
combustion deposits. The electrodes are not burned or eroded. This indi-
cates the proper type and heat range for the engine and the service.
Tip: The tip should not be white. A white insulator tip indicates overheating,
caused by use of an improper spark plug or incorrect carburetor/throttle
body adjustments.
Wet Fouled Spark Plug
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 or
use of non-recommended injection oil.
Spark Plug Removal and Replacement
1. Remove the spark plug cap.
2. Using the special wrench provided in the tool pouch, rotate the
spark plug counter-clockwise to remove.
3. Reverse the procedure for spark plug installation.
4. Torque to 18-22 ft. lbs. (24-30 Nm).
5. Reinstall the spark plug cap.
MAINTENANCE
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