2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 54Get this manual
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ENGINE (300) Engine Service Data
.002" (0.05 mm) 3.0590-3.0598" (77.70-77.72 mm) .002" (0.05 mm) .0015-.0032" (0.038-0.082 mm) .0043" (0.11 mm) 1st O.S+ .0098" (.25 mm) 2nd O.S+ .0197" (.50 mm)