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MAINTENANCE
Spark Plugs
It’s very important to use the correct spark plug for your machine. A
spark plug with a heat range too high will cause engine damage. A spark
plug with a heat range too low will cause excessive fouling and engine
malfunctioning.
NOTICE: A spark plug with a heat range too high will always cause engine dam-
age if the engine is operated in conditions more severe than intended
for that plug. Always use the spark plugs recommended for your
snowmobile. See your Owner’s Manual Supplement.
A new engine can cause temporary spark plug fouling due to the preser-
vative added during the assembly process. Avoid prolonged idle speeds,
which cause plug fouling and carbonization.
• Use recommended spark plugs with the proper gap. See your Owner’s
Manual Supplement.
• Torque spark plugs to 18-22 ft. lbs. (24-30 Nm).
• Always carry spare spark plugs.
Spark plug condition is indicative of engine operation. The spark plug
firing end condition should be read after the engine has been warmed up
and the vehicle has been driven at higher speeds. Immediately check the
spark plug for correct color.
CAUTION! A hot exhaust system and engine can cause burns. Wear
protective gloves when removing a spark plug for inspection.
Tip: Incorrect fuel mixture can often cause a spark plug to appear too dark or too
light in color. Before changing spark plug heat ranges, be sure the correct
main jet is installed in the carburetor(s). Refer to the Owner's Manual Sup-
plement or see your dealer.
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