2007-2009 Honda TRX300EX TRX300X service manual, Page 143Get this manual
CYLINDERPISTON Calculate the cylinder for taper and out-of-round at three levels in an and axisTake the maximum reading to determine the taper and out-of-round
SERVICE LIMITS: Taper: 0.10 mm (0.004 in) Out-of-round: 0.10 mm (0.004 in)
Check the top of the cylinder for warpage with straight edge and feeler gauge across the stud holes
SERVICE LIMIT: 0.05 mm (0.002 in)
PISTONPISTON RING