1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 273Get this manual
REAR DRIVING MECHANISM Remove the pinion bearing lock nut using the spe cial tool as shownLOCK NUT WRENCH
Lock nut wrench, 30 64 mm
07916-MB00002
Install the pinion puller attachment tool onto the gear caseScrew 'the shaft puller onto the th reads of the drive pinionTurn the 23 mm special nut counterclockwise with 23 mm wrench while holding the shaft with 17 mm wrench to remove the drive pinion from its housingPull the drive pinion assembly off with the shaft puller
PINION PULLER SET