2007-2009 Honda TRX300EX TRX300X service manual, Page 144Get this manual
CYLINDERPISTON Measure the piston 0.0at point 20 mm (0.8 in) from the bottom and 90 to the piston pin holeSERVICE LIMIT: 73.90 mm (2.909 in)
Compare this measurement against the maximum cylinder 1.0measurement and calculate the cylinder-to-piston clearance (page 8-5)
Measure the piston pin hole 1.0Take the maximum reading to determine the 1.0SERVICE LIMIT: 17.04 mm (0.671 in)
Measure the piston pin .0 at three pointsSERVICE LIMIT: 16.96 mm (0.668 in)
Calculate the piston-to-piston pin clearanceSERVICE LIMIT: 0.80 mm (0.031 in)
CONNECTING ROD