2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 99Get this manual
ENGINE 14Measure the distance from the Mag crankcase mating surface to the balance shaft bearing using dial caliper and straight edgeSubtract the thickness of the straightedge and record15Measure the distance from the PTO crankcase mating surface to the bearing using the same method outlined in Step 1, 2, and-316Add the readings obtained in Step and Step 417Subtract the counter balancer shaft width measured in Step from the figure obtained in Step 518Subtract the thickness of the existing shim from the result of Step to determine if different shim is neededThe result must be within the specified range listed at belowCounter Balance Shaft End Play: .008"-.016" (.02-.04 cm) 3Install the gear on the oil pump and measure the width of the pump and gearSubtract this measurement from the measurement recorded in Step 2Subtract the thickness of the existing shim from the result of Step to determine if different shim is neededSee Shaft End Play SpecOil Pump Shaft End Play: .008"-.016" (.02-.04 cm)