Honda NX500 Owner's Manual page 69

Adjustment:
Drive chain slack should be checked and
adjusted , if necessar y, every 1,000 km (600
miles). When operated at sustained high
speeds or under conditions of frequent
rapid acceleration , the cha in may requir e
more frequent adjustment.
(4)
(1) Axle nut
(2) Lock nut
(3) Drive chain
adjusting nut
62
(3)
(4) Index mark
(5) Rear edge of
adjusting slot
...
If the drive chain requires adjustment, the
procedure is as follows:
1. Loosen the axle nut (1).
2. Loosen the lock nuts (2) on both side of
the swingarm.
3. Turn both adjusting nuts (3) an equal
number of turns until the correct drive
chain slack is obtained. Turn the
adjusting nuts clockwise to tighten the
chain, or counterclockwise to provide
more slack. Adjust the chain slack at a
point midway between the drive
sprocket and the rear wheel sprocket.
Rotate the rear wheel and recheck
slack at other sections of the chain.
Chain slack should be :
35-45 mm (1.2-1.8 in)
4. Check rear axle alignment by making
sure the chain adjuster index marks (4)
align with the rear edge ( 5) of the
adjusting slots .