2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 124Get this manual
CYLINDER HEADVALVE Be careful nOI !O ler Remove the cam sprocket bo ltthe bolts fall into Rotate the crankshaft coun erclockwise one turn the crankcaSB_ and remove the other cam sprocket bolt
Remove the cam sprocket off he camshaft flangeAttach piece of wire to the cam chain to prevent it from falling into the crankcaseLift the camshaft and remove itRemove the cam sprocket from the cam chain