2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 325Get this manual
CRANKCASETRANSMISSIONCRANKSHAFTBALANCER (After '05)
BALANCER GEARBALANCER
REMOVAL
Remove the following: right crankcase cover (page 14-5) flywheel (page 21-12) clutch assembly (page 14-6) GEAR HOLDER
BOLTWASHER
Temporarily install the clutch outer guide, needle bearing and clutch outer onto the mainshaftInstall the special tool between the primary drive and driven gears as shown, and loosen the primary drive gear boltTOOL: Gear holder, M2.5 07724-0010100 or 07724-001A100 (U.S.Aonly)