Polaris YOUTH ATV 2001 Owner's Safety And Maintenance Manual page 178

MAINTENANCE
2. Wet Fouled
The 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. Gener-
al causes are excessive oil, use of non-recommended injection oil, improper use
of the choke, or incorrect carburetion adjustments.
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