NOTE— After chain adjustment rear brake should be checked and readjusted as necessary. See 'Brake adjustment'. 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 10 ft. 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 sprocket. Remove the string, refit the connecting link with the spring clip closed end facing direction of rotation. To remove the rear chain guard (fully enclosed type). Remove bottom fixing nut on left-hand rear suspension unit, and slide the lower end of the unit off the stud, slacken the left-hand wheel spindle nut. Remove the two chaincase securing bolts. The large spindle washer is used outside the guard. The top and bottom halves of the chaincase can then be removed. Open chain guard. Remove bottom fixing nut on Left-hand rear suspension unit and slide the lower end of the unit off the stud. Remove rear brake rod adjuster nut, rear chain and speedometer cable, slacken wheel spindle nuts. Remove the two chain guard securing bolts, lift the rear of the chain guard and slide the rear wheel out of the fork ends. The rear chain guard can now be removed. Reverse this procedure for reassembly. Front chaincase oil seal. The felt washer in the rear half of the chaincase, for the gear box mainshaft is fitted before the plates are spot welded. If this seal is unserviceable, take a new felt ring and using a razor blade, cut the new one into two. The ring half its normal thickness can be pressed between the steel plates.
CARBURETTER
Carburetter tuning information Poor idling may be due to:
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