Honda TRX400EX FOURTRAX 1999 Service Manual page 190

REAR WHEEL/SUSPENSION
Turn the inner race of each bearing with your finger.
The bearings should turn smoothly and quietly. Also
check that the bearing outer race fits tightly in the
holder.
Remove and discard the bearings if the races do not
Replace the axle
turn smoothly and quietly or if they fit loosely in the
bearings in
holder.
INSTALLATION
STOPPER BUSHING
I
RING
BOLTS
DRIVEN SPROCKET