2000-2003 Honda TRX350 Rancher factory service manual, Page 182Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT
CRANKCASE ASSEMBLY
Clean the front and rear crankcase mating surfaces thoroughly, being careful not to damage themBlow through the oil passages in the crankcases with compressed airWash the strainer screen thoroughly in high flash point solvent until all accumulated dirt has been removedBlow the screen dry with compressed airInstall the strainer plate and oil strainers with the thin side of the strainer facing toward the crankcase