AJS Highway Star 125, Owner'S Manual, Page: 39 / 61

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To adjust the drive chain:
1) Put the motorcycle on flat level ground. Use a
paddock stand or similar.
2) Slacken the rear axle nut,
but not fully undone.
3) Loosen the locknuts on both left and right chain
pullers.
4) The rear axle, swinging arm pivot and centre of the
output shaft should be in near perfect alignment.
The chain should be adjusted to give 10-20mm free
play in this tightest position. Load may have to be
applied to the rear of the motorcycle to achieve this.
5) Turn the left and right chain puller adjuster bolts
a little and evenly until the correct chain tension is
achieved. Ensure the rear wheel is in alignment.
6) Re tighten the rear axle nut to the correct torque
setting and chain puller locknuts.
7) Re check the drive chain tension. Turn the rear
wheel and check again. Re-adjust if not correct.
Chain puller locknut
Adjust the chain in its tightest position to give 10-
20mm free play.
10-20mm
When replacing the drive chain, also replace the
sprockets, as a chain and sprocket set.
A new chain will not sit well on worn sprockets.
CAUTION!
WARNING!
Health risk
Always wear protective gloves when handling oil,
kerosene or de-greaser.
Ensure the rear wheel is aligned correctly after any
adjustments have been made.
CAUTION!
1
2
3
Rear axle nut
1 2
Chain puller 3