A.J.S. 16MS, Instruction Book

Page: 49 / 94

NOTES ON REAR CHAIN ADJUSTMENT
Before tightening the rear chain always first check front chain adjustment and if attention
is necessary adjust the front chain first. This is because adjustment of the front chain
disturbs that of the rear chain.
Therefore, after making adjustment to the tension of the front chain, always afterwards
check that of the rear chain.
It should also be noted that adjusting the rear chain will disturb rear brake adjustment,
which should therefore always be checked subsequently.
REMOVING AND REFITTING REAR CHAIN
To protect the rear chain from mud and water it is very closely shrouded by the chain
guard and removing the chain without first detaching the chain guard can present
considerable difficulty. A simple procedure however is as follows.
First obtain a piece of thin string about ten feet long.
With cycle on the stand turn the rear wheel until the chain connecting link is at a
position near the rear sprocket and remove the connecting link.
Now pass the string through the centre hole of the end link of the top run, draw the
two ends of the string level and tie together.
Then pull the bottom run of the chain backwards with one hand while keeping the string
taut at the rear end with the other hand.
As the end of the top run of the chain disengages with the gear box sprocket it will leave
the string attached lying one strand each side of the sprocket teeth.
When the chain is well clear cut the string one side only at a point about one foot from
where it is looped through the chain link.
Leave the string then
in situ awaiting chain refitting.
To refit the chain.
Pass the longer cut end of the string through the centre hole of the end chain link and
then tie the two loose ends of the string together.
Then pull the string from the rear end, at the same time guiding the chain up to engage
with the gear box sprocket.
Continue pulling until the chain encircles the rear wheel sprocket, then remove the
string and refit the connecting link, taking care while doing so to attach the spring clip
with its closed end facing the direction of rotation. .
DYNAMO CHAIN ADJUSTMENT
The dynamo armature shaft is eccentric to the body of the dynamo. Therefore, by
partially revolving the dynamo in its housing the distance between the two dynamo
driving sprockets can be varied, thereby allowing latitude for chain adjustment.
Tighten dynamo chain by :
Remove inspection cap from front chaincase
Slacken dynamo clamping strap bolt.
With the fingers turn dynamo bodily in an anti-clockwise direction till, by passing a
finger through the inspection cap opening, it can be felt the chain tension is correct.
The chain whip should be about ¼". Ensure, when feeling tension, the front driving
chain is not confused with the dynamo chain which lies behind the front driving chain.
Tighten dynamo clamping strap bolt.
Re-check chain tension.
Replace chaincase inspection cap.
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