1998-2004 Honda Foreman 450 factory service manual, Page 89Get this manual
LUBRICATION SYSTEM Apply clean engine oil to the new O-ringsInstall the O-rings onto the oil cooler pipe flangesInstall the oil pipes into the front crankcase cover
Install the oil cooler pipe setting plate and tighten the socket bolts securelyFill the recommended engine oil (page 3-10)