2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 133Get this manual
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}
Insert eltCh piston ring squarely into the cylinderMeasure the end gapSERVICE LIMITS: TOP:
0.5 mm [0 .02 inl SECOND: 0.5 mm 10 .02 inl
M easure the piston diameter 20 mm (0,8 inl from the bo tt om of the skirt and at ri ght II ogle to the piston holeSERVICE LIMIT: 73.90 mm (2.909 in)