1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 256Get this manual
ENGINES Crankshaft and Crankcase Reassembly Before reassembling the crankcase, the following steps should be performed to determine the amount of crankshaft end playExcessive end play will cause the engine to be noisy at idle and slow speedsToo little end play will side load the main bearings, which may cause premature bearing failure1Measure distance from outer edge of PTa end bearing race to outer edge of mag side bearing raceRecord readingIf bearings and spacers are already installed, measure distance as shown in photo at right