Rear Chain
The rear chain is adjusted by means of draw bolts at the fork ends at the back of
the wheel spindle. First slacken off the brake adjuster, as the brake rod may prevent
free movement of the wheel. It is not necessary to disturb the speedometer drive unit.
Slacken off the spindle nuts A (Fig. 7) and tighten the adjusting nuts B until the chain
tension is correct.
The chain should be adjusted with the machine on its stand, i.e., with the rear
wheel in its lowest position in the rear suspension. The adjustment is correct when
the total up and down movement in the centre of the chain run at its tightest point is
¾ in.
Make sure that the adjusters are firmly against the fork ends when checking, and
also that the adjustment is equal on both sides of the wheel so that the latter is in
correct alignment in the frame. This can be done either by glancing along the line of
both wheels when the front wheel is set straight, or by means of a long straight-edge
or the edge of a plank placed along the sides of the wheels. The straight-edge should
touch the wall of each tyre in two places.
After adjusting, do not forget to retighten nuts A.
Fig. 7. Rear Chain Adjustment
Brakes
The brakes should be adjusted whenever the handlever or foot pedal movement has
become excessive. The shoes should be just clear of the drum when the brake is off,
but close enough for immediate contact when the brake is applied. The brakes must
not be adjusted so closely however, that they are continually in contact with the
drum, otherwise excessive heat may be generated resulting in deterioration of braking
efficiency.
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