As the chain leaves the gear box sprocket, the string will be each side
of the sprocket teeth.
When the chain is well clear, cut one piece of the string about one foot
from where it passes through the chain.
Detach the chain, leaving the string in position.
To refit the chain. Pass the longer end of the string through the chain
and tie the ends together. Now pull on the string, guiding the chain until
it encircles the gear box sprocket. Continue pulling until the top run en-
circles the rear wheel sprocket and fit the connecting link.
Lightweight Models
Front chain adjustment. Remove inspection cap from front chaincase;
remove the two securing screws on the rear engine cowling; lift the cowl-
ing to expose the gear box adjuster bolt.
Slacken nut on left-hand side of gear box top fixing bolt.
Slacken two clamping strap bolts.
Adjust chain by means of adjuster eye-bolt 043938 and two nuts. (The
correct whip is a".)
Check the adjustment in several positions and adjust at tightest part
of chain.
Tighten two clamping strap bolts, top gear box fixing bolt.
Refit rear engine cowling and securing screws.
Replace chaincase inspection cap.
NOTE—After adjusting front chain, check rear chain adjustment.
Removing the front chain (350 c.c. and 250 c.c. CSR Models). The front
chain fitted to this model is duplex and endless, which means that the
clutch sprocket, also the engine sprocket must be withdrawn simul-
taneously if the front chain is to be removed. To proceed, follow the in-
structions given for dismantling the clutch, as far as removing the gear
box mam axle shaft nut. Then remove the nut and washer retaining the
rotor to the driving side engine shaft, take out the key for the rotor from
the shaft. The engine sprocket and clutch, together with the chain in
position, can then be withdrawn.
NOTE—One or more shim washers may be fitted at the rear of the engine
sprocket, which must be replaced during assembly.
Rear chain adjustment. Prior to adjusting rear chain, check front chain
and adjust if required.
Loosen both nuts on the rear wheel spindle.
Loosen lock nuts on the adjusters and turn the adjusters until correct
chain adjustment is obtained, taking care to move both adjusters exactly
the same amount to maintain wheel alignment.
While on the stand the chain whip should be ¾" to ensure ½" whip
when rider is seated.
Check the adjustment in several positions and adjust at tightest part
of chain.
Remove the rubber cap on the totally enclosed chain guard to check
chain tension.
Retighten wheel spindle nuts, and adjuster lock nuts.
101
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