Polaris 120 XC Rider's Safety Manual And Owner's Operation And Maintenance Manual page 54

MAINTENANCE
Wet Fouled
The insulator tip is black. A damp oily film covers the firing end. There may be a
carbon layer over the entire nose. Generally, the electrodes are not worn. Causes
could be excessive oil, use of non-recommended injection oil, excessive idling, idle
too low or too rich, or weak ignition output.
Fuel Valve/Fuel Lines
The fuel valve and the fuel lines
should be inspected regularly. Spe-
cial attention should be given to the
system's fuel line condition after pe-
riods of storage. Normal deteriora-
tion from weather and fuel com-
pounds can occur.
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