2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 182Get this manual
CYLINDERPISTON Check the top of the cylinder for warpage with straight edge and feeler gauge across the studs and bolt holes as shown
SERVICE liMIT: 0.10 mm (0.004 in)
PISTON PISTON RING
Inspect the piston rings for smooth movement by rotating themThe rings should be able to move in their grooves without catchingPush the ring until the out er surface of the piston ring is nearly flush with the piston and measure the ring -to-r ing groove clearanceSERVICE LIMIT: Top Second0.09 mm 10.004 in)