2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 71Get this manual
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ENGINE (300) Piston Inspection
= In mmPiston to Cylinder Clearance Std: .0015- .0032" (0.038- 0.082 mm) Limit: .0043" (.11 mm) 3 Measure piston pin boreReplace piston if out-of-round
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