1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 122Get this manual
CYLINDER HEAD CYLINDERPISTON PusiJtherings nto the cylinder with the top of the piston to be slire they are squarely In the cylinder
Insert the pist on ring square ly into the bottom of the cylinder and measure the ring end gapSERVICE LIMITS: Top: 0.5 mm (0.02 inl Second: 0.7 mm 10.03 in)
PISTON RING INSTALLATION
Clean the piston ring grooves thoroug hly and install the iston ringsNOTE :
TOP RING
Apply oi to the piston rings Avoid iston and piston ring damage during installatione lnstall the piston rings wi th their marking faC ing up Do not mix the top and second rings; the top ring is narrower han the second ring in width