2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 53Get this manual
MAINTENANCE 4Set idle speed to 1200 RPMAlways check throttle cable freeplay after adjusting idle speed and adjust if necessary5Slowly turn mixture screw clockwise using the pilot screw wrench until engine begins to miss6Slowly turn mixture screw counterclockwise until idle speed increases to maximum RPMContinue turning counterclockwise until idle RPM begins to drop7Center the pilot screw between the points in Step and 68Re adjust idle speed if not within specificationTo Carburetor
Fuel Filter (Non EFI)
The fuel filter should be replaced in accordance with the Periodic Maintenance Chart or whenever sediment is visible in the filterArrow Indicates Direction of Flow
Idle Speed Adjustment (Non EFI)