2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 72Get this manual

2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 72

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PISTON IDENTIFICATION

Pistons and rings marked 25 equal .25mm (.010") oversized Pistons and rings marked 50 equal .50mm (.020") oversized