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Maintenance
Spark Plugs
NORMAL: 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. NOTE: The tip should not be white. A
white insulator tip indicates overheating, caused by use of an improper spark plug or
incorrect carburetion adjustments.
WET FOULED: 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 carburetion adjustments.
Spark Plug Removal and Replacement
1. Remove the spark plug cap.
2. Using the special wrench provided in t he tool pouch, rotate the spark plug
counterclockwise to remove.
3. Reverse t he procedure for spark plug installation. Torque to 14 ft. lbs. (19 Nm).
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