2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 274Get this manual
CLUTCHSTARTER CLUTCHKICK STARTERGEARSHIFT LINKAGE (After '05) Hold the clutch center using the special tool and tighten the lock nutTOOL: Clutch center holder 07724-0050002 or 07724-0050001 or equivalent commercially available in U.S.ACLUTCH CENTER HOLDER
TORQUE: 108 N-m (11.0 kgf m, 80 Ibf-ft)
Bend the lock washer tabs against the clutch center lock nut