2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 390Get this manual
REAR WHEELSUSPENSION Install the snap ring into the bearing holder groove with the "OUT SIDE" mark facing outSNAP RING
Install the driven sprocket with the four socket bolts, washers and nuts, and tighten the nutsTORQUE: 59 N-m (6.0 kgf m, 43 Ibf-ft) Coat new O-ring with oil and install it between the driven sprocket flange and axle
Install the rear axle into the bearing holder through the drive chain until it is fully seatedInstall the drive chain over the driven sprocketInstall the drive chain guard with the collars and new bolts, and tighten the boltsTORQUE: 9.8 (1.0 kgf m, Ibf-ft)