2000-2003 Honda TRX350 Rancher factory service manual, Page 119Get this manual
CYLINDER HEADVALVE HEAD COVER Clean the mating surfaces of the head cover and cylinder headBlow through the oil passage in the head cover with compressed airInstall the following: new gasket new O-ring (coat with engine oil) O-RING GASKET
Install the cylinder head cover and tighten the four boltsInstall the heat guard and fuel tank (page 5-17)
HEAD COVER
CAMSHAFT REMOVAL
Remove the following: cylinder (section 8) flywheel and starter driven gear (section 10)