1999-2004 Honda TRX400EX FourTrax Service Manual, Page 116Get this manual
CYLINDERPISTON -a
Measure piston pin hole I.Din an and axisTake the maximum reading to determine the I.D-
SERVICE LIMIT 20.060 mm (0.7898 in)
Measure the piston pin O.Dat three points
SERVICE LIMIT: 19.964 mm (0.7860 in)
Calculate the piston-to-piston pin clearance
SERVICE LIMIT 0.096 mm (0.0038 in1
Measure the connecting rod small end I.D