1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 236Get this manual
ENGINES
2 Stroke Maintenance
Oil Pump Adjustment Procedure (250300 Engines)
1Before adjusting the oil pump, check engine idle RPMRecommended RPM is 500 to 800Adjust if necessaryAlso check carburetor adjustmentsStart the engine and let it idlePlace very slight pressure on the throttle lever until all freeplay is removed from throttle cable to carburetorLoosen locknut (0) and align marks (A) and (C) by turning adjuster (E) up or down as neededWhen the marks are aligned, tighten locknut (0)2
Oil Pump Adjustment Procedure (350400L Engines)
1Before adjusting the oil pump, check engine idle RPMRecommended RPM is 500 to 800Adjust if necessaryAlso check carburetor adjustmentsRemove electronic throttle control (ETC) coverLoosen cable jam nut and turn adjuster in or out until there is 116" (.16 cm) of throttle lever travel before throttle slide starts to openNOTE: The throttle lever freeplay must be adjusted correctly to prevent backfiringAdjust oil pump cable until marks align (F) when throttle slide just begins to raiseTighten jam nutsReinstall the ETC cover removed in step 2, making sure cover gasket is properly seatedIf not, moisture will enter the ETC and damage the switch