Polaris Frontier Owner's Manual page 86

MAINTENANCE
General Maintenance
Spark Plugs
Using non-recommended spark plugs can result in serious engine
damage. Always use Polaris-recommended spark plugs.
S Use Champion RC7YC spark plugs.
S Proper electrode gap is .035" (.9 mm)
S Spark plug torque is 18-22 ft. lbs. (24-30 Nm).
Change spark plugs annually and whenever inspection reveals fouled
or damaged plugs. Always use the recommended spark plugs 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.
NOTE: Always carry spare spark plugs in case of an emergency.
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CAUTION