2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 111Get this manual
CYLINDERPISTONCAMSHAFT Check the cylinder for warpage by placing straight
edge and feeler gauge across the stud holes as
shownSERVICE LIMIT: 0.10 mm (0.004 in)
PISTON PISTON RING Temporarily insta ll the piston ri ngs to their proper position