2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 127Get this manual
CYLINDERPISTON Install the new copper washer and cylinder mounting bolt but do not tighten it yet
Apply engine oil to the cam chain guide roller and pin boltDo nOllel me cem cham gUide roller faJI Into the crankcase
Install the cam chain guide roller, new sealing asher and pin bolt
Tighten the cam chain guide rolier pin bolt to the specified torque