1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 292Get this manual
REAR DRIVING MECHANISM Blow compressed air through the breather hole in the final drive case
Pull the bearing outer and inner races off the shaft with the bearing pullerPull the other inner race off with the same toolRemove the pinion adjustment spacer
To reassemble, first install the pinion spacer
When the gear set, pinion bearing andor gear case have been replaced, use 2.00 mm (0.079 in) thick spacer