Polaris 550 Indy Sport 2024 Owner's Manual page 80

MAINTENANCE
SPARK PLUG
SPARK PLUG RECOMMENDATIONS
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. Change
the spark plugs every 2000-2500 miles (3200-4000 km)
NOTICE
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.
A new engine can cause temporary spark plug fouling due to the preservative
added during the assembly process. Avoid prolonged idle speeds, which cause
plug fouling and carbonization.
• Use recommended spark plugs with the proper gap.
• Use only resistor-type spark plugs.
• Torque spark plugs to specification.
TORQUE
Spark Plug
18-22 ft-lbs (24-30 N·m)
• Always carry spare spark plugs.
SPARK PLUG CONDITION
NORMAL 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 indicates the proper
type and heat range for the engine and the service.
TIP
The tip should not be white. A white insulator tip indicates overheating, caused
by use of an improper spark plug or incorrect carburetor/throttle body
adjustments.
WET FOULED 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 or use of non-recommended
injection oil.
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