1997-2004 Honda Fourtrax Recon TRX250TE/TM Service Manual, Page 135Get this manual
CYLINDER HEADCYLINDERPISTON Inspect the piston for wear or amageMeasure the diameter of the piston at18 mm (0.20.7 n) from the bottom and 90 degrees to the piston pin hole
SERVICE LIMIT: 68.4 mm (2.69 in)
Measure the piston pin bore
SERVICE LIMIT: 15.04 mm (0.592 in)