1998-2004 Honda Foreman 450 factory service manual, Page 94Get this manual
LUBRICATION SYSTEM Remove the snap ring, washer and oil pump shaftMark the rotors which side is up, so they can be reinstalled the same wayDisassemble the oil pumpPUMP SHAFT WASHER
SNAP RING Thoroughly clean all the componentsInstall the outer and inner rotors into the pump body and temporarily insert the oil pump shaftMeasure the pump body clearanceSERVICE LIMIT: 0.25 mm (0.010 inJ