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MAINTENANCE
Spark Plugs
Spark Plug In sp ection
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
indicates the proper type and heat range for the engine and the service.
NOTE: The tip should not be flaky and white. A white insulator tip
indicates overheating, caused by use of an improper spark
plug or incorrect carburetion 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,
use of non-recommended oil, improper use of the choke, or incorrect
carburetion adjustments.
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