2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 99Get this manual
ENGINE 4Measure the distance from the Magneto crankcase mating surface to the main bearing using the same method and record8Subtract the Crankshaft Width measured in Step from the Total Case Width recorded in Step 6, and record belowTotal End Play 9Subtract 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 listed belowCrankshaft End Play: .008"-.016" (.02-.04 cm)
Counter Balancer Shaft End Play Adjustment
5Subtract the thickness of the straightedge from the measurement obtained in Step and record1Make sure all bearings are firmly seated in the crankcase2Measure the width of the counter balancer shaft at the bearing seats with dial caliper or micrometer, and record reading