2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 89Get this manual
4Measure the distance from the Magneto crankcase mating surface to the main bearing using the same method and record
7Measure the width of the crankshaft at the bearing seats with micrometer or dial caliper and recordCrankshaft Width 8Subtract 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 at rightCrankshaft End Play: .008 -.016 (.02-.04 cm)