Polaris Sportsman 9921828 User Manual download pdf (Page 100)

MAINTENANCE

Spark Plugs

Spark Plug Inspection

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.

The tip should not be flaky and white. A white insulator tip indicates

overheating, caused by use of an improper spark plug or incorrect fuel.

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 or incorrect throttle body adjustments.

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Polaris Sportsman 9921828 User Manual Page 100