2004-2005 Honda TRX450R Factory Sevice Manual, Page 164Get this manual
CYLINDERPISTON
SERV ICE INFORMATION
GENERAL
The cylinder and piston can be serviced it he engine nstalled in he frameTake care not to damage the cylinder wall and piston Be careful not to damage the mating surfaces when removing the cylind er Cam shaft and rocker arm lubricating oil is fed through an oil passage he cylinderClean the oil passage before installing cyli nder
SPECIFICATIONS
Cylinder
STANDARD
U nitmm (inl SERV ICE LIMIT
10 Out-of-round Taper Warpage Pist .0at 20 (0.8) fro bottom
94.00094.015 (3.7008 3.7014}
94.05 0.05 (0.0021 0.05 (O.D02)
0 .05 (O.D02)
piston pin,
piston ring