Polaris 550 IQ Shift - Manual (Page 73)

70
MAINTENANCE
Spark Plugs
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.
Refer to your Owner's Manual Supplement for the specific spark plug to
be used in your machine.
Change the spark plugs every 2000-2500 miles (3200-4000 km).
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.
NOTE: 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 Supplement or see your dealer.
NOTICE
Using non-recommended spark plugs can result in serious engine damage.
A spark plug with a heat range too high will always cause engine damage 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.
• Use recommended spark plugs with the proper gap.
• Use only resistor-type spark plugs.
• Torque spark plugs to 18-22 ft. lbs. (24-30 Nm).
• Always carry spare spark plugs.
CAUTION
A hot exhaust system and engine can cause burns. Wear protective gloves
when removing a spark plug for inspection.