2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 146Get this manual
CYLINDER HEADIVALVECAMSHAFT Apply engine oil to the camshaft bearings
lubricate the cam lobes and cam chain with molybdenum oil solution
Do nor rum the
crankshaft while
mstallmg
Install the cam chain over the cam sprocket and insert the camshaft into the crankcaseCarefully align the punch mark (N250"sidel with the index mark, then in sl alilhe chain onto the timing sprocket of the crankshaft
Apply locking agent to the retainer bolt threadsInstall the bearing retainerRest the retainer against the stopper and tighten the bolt securely