1995-2003 Honda Foreman TRX400FW TRX400 TRX 400 400FW Service Manual, Page 70Get this manual
LUBRICATION SYSTEM Apply clean engine oil to the new O-ringsInstall Ihe O-, inllS onlO the oil cool" pipe n"nllesIn$lall the oil pipes imo Iha from crankcase cover
IMtell the oil cooter pipe setting ptate and tighten ttle socket boilS securelyFill the fecommene(l engine 011 (page 3-91