2004-2005 Honda TRX450R Factory Sevice Manual, Page 219Get this manual
CRANKCASETRANSMISSIONCRANKSHAFTBALANCER Install the dowel pins and new gasket onto the left crankcase
Coat the oil seal contacting surface of the crankshaft ith oil
Install the right crankcase onto the left crankcase
Coat the countershaft seal ring with grease and install the countershaft collar onto the countershaftCoat new O-ring with oil and install it onto the oi pipeInstall the oil pipe into the right crankcaseInstall the relief valve and oil strainer (page 5-5)