1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 144Get this manual
CYUN, ER HEADCYLINDERPISTON D Push the rings into lJle cylinder Iith the lOp of the piston to be sure liler are
jn sert the pisto rin square ly into the bo ttom of the cylinder and measure the ring end gapSERVice LIMITS: Top: 0.5 mm (0.02 In) Sec,a nd: 06 mm (0.02 In)
squarely in the cyJirrdj r
PISTON RING INS-TALLAnON
Clean the piston ri ng grooves th oroughly and insta ll the piston rings NOTE:
Apply oil to the pisto ri ngs Avoid pi ston and piston ring dama du rin instal lationIn sta ll the piston ri ngs with their marking fa cing, up Do not mix he top and second (In'g5; 'the top ri,ng is narrower than the secon ring in width Space the piston ri ng end gaps degrees apart;20 Do not align the gaps in the oi rings (side rails)After insta ll ation, tl1e rings sho lei rotate freely tn he ring grooves