2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 112Get this manual
CYLINDERPISTONCAMSHAFT Inspect the piston for abnormal wear or damage
Measure the diameter of the piston at 6-14 mm (0.2-0.6 in) from the bottom and 90 to the piston pin holeSERVICE LIMIT: 68.4 mm (2.69 inl
Compare this measurement against the maximum cylinder 1.0measurement and calculate the piston-tocylinder clearance (see previous pagelMeasure and record the piston pin bore 1.0in an and axisTake the maximum reading to determine the I.DSERVICE LIMIT: 15.04 mm (O.592 in)
Measure and record the piston pin 0.0at three pointsSERVICE LIMIT: 14.96 mm (0,589 in) Calculate the piston-la-piston pin clearance by subtracting the piston pin 0.0from the piston pin hole l.D