2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 73Get this manual
LUBRICATION SYSTEM
PUMPeOV"R
DRIVEN GEAR SHAFT
INSPECTION
Inst811 the outer and inner rotors into the oil pump body and insen the oil pump driven gear shaftMeasure the pump body clearanceSERVICE LIMIT: 0.25