2006 Honda TRX680 Rincon Factory Service Manual, Page 225Get this manual
CYLINDER HEADVALVECAMSHAFT INSTALLATION Turn the crankshaft using the recoil stater knob and align the "T" mark with the index notch, then check the cam lobes through the cam follower holesIf the cam lobes face up, rotate the crankshaft one full turn and match up the "T" mark again so the cam lobes face downINDEX NOTCH "T" MARK
Coat the cam followers with engine oil and install them into the cylinder head
Install the dowel pins and new gasketInstall the push rods in the cam followers and rest them on the gasket cutout as shown