Honda CRF125F 2023 Owner's Manual page 115

Drive Chain
6. Inspect the front and rear sprocket teeth for
excessive wear or damage. If necessary, have
your dealer replace a worn sprocket.
Damaged Sprocket
Teeth
REPLACE
Normal Sprocket Teeth
Use of a new chain with worn sprockets will
cause rapid chain wear.
106
Servicing Your Honda
Worn Sprocket
Teeth
REPLACE
GOOD
Adjustment
RIGHT SIDE
(4)
(2) (3)
(1) rear axle nut
(2) lock nut
(3) adjusting nut
1. Loosen the rear axle nut (1).
2. Loosen the lock nuts (2) on both sides of the
swingarm.
(5)
(1)
(4) notch
(5) graduated scale