Honda CRF250F 2023 Owner's Manual page 111

Drive Chain
Adjustment
LEFT REAR
(5)
RIGHT REAR
(1) rear axle shaft
(2) rear axle nut
(3) chain adjusters
(4) index marks
(5) stopper pins
102
Servicing Your Honda
(1)
(4)
(4)
(3)
(2)
1. Hold the rear axle shaft (1) and loosen the
rear axle nut (2).
2. Turn both the right and left chain adjusters
(3)
(3) equally to increase or decrease chain
slack.
3. After adjusting, be sure the same adjuster
index marks (4) align with the stopper pins
(5) on both sides of the swingarm.
4. Tighten the rear axle nut to the specified
torque:
80 lbf·ft (108 N·m, 11.0 kgf·m)
5. Recheck drive chain slack.
(5)
If a torque wrench is not used for this
installation, see your dealer as soon as possible
to verify proper assembly.