Honda 2004 XR400R Owner's Manual page 135

Drive Chain
6. Inspect the front and rear sprocket teeth for
excessive wear or damage. If necessary, have
your Honda dealer replace a worn sprocket.
Damaged Sprocket
Teeth
REPLACE
Normal Sprocket Teeth
GOOD
Use of a new chain with worn sprockets will
cause rapid chain wear.
126
Servicing Your Honda
LEFT SIDE
Worn Sprocket
Teeth
REPLACE
RIGHT REAR
(1) axle
(2) axle nut
(3) chain adjuster
(4) index mark
(5) stopper pin
Adjustment
(5)
(2)
(4)
(3)
(1)