2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 72Get this manual
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ENGINE (300) Piston Ring Installed Gap
Cylinder
Piston Ring
= In mmPiston Ring Installed Gap TOP RING Std: .008- .012" (.2- .3 mm) Limit: .032" (0.8 mm) SECOND RING Std