2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 22Get this manual

2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 22

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MAINTENANCE Pilot Screw and Idle Speed Adjustment
It is recommended that the air filter and pre filter be replaced annuallyWhen riding in extremely dusty conditions, replacement is required more