2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 133Get this manual
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CYLINDERPISTON Install he pist on ring as shollYnMeasure the piston ring -la-groove clearanceSERVICE LIMITS: TOP: 0.11 mrn 10.004 inl SECOND: 0.095 mm 10,0037 in}
20mm (0.8 in)