2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 98Get this manual
ENGINE 6Measure the distance from the Magneto crankcase mating surface to the main bearing using the same method and record10Subtract the Crankshaft Width measured in Step from the Total Case Width recorded in Step 6, and record belowTotal End Play_ 11Subtract the thickness of the existing shim from the result of Step to determine if different shim is requiredThe result must be within the specified range listedCrankshaft End Play: .008-.016" (.02-.04 cm)
Counter Balancer Shaft End Play Adjustment7Subtract the thickness of the straightedge from the measurement obtained in Step and recordMag Case Depth_ 8Add the readings recorded in Step and Step and record belowTotal Case Width_