2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 104Get this manual
LUBRICATION SYSTEM ('04'05) Install the guide plate by aligning the hole with the boss and tighten the bolt securely
Coat new O-ring with oil and install it into the pressure relief valve groove
Install the pressure relief valve into the left crankcaseApply locking agent to the bolt threadsInstall the set plate and tighten the bolt securely