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BSA M20 - Page 22

BSA M20
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the spring (this does not apply after decarbonising).
Lock the central nut up tight, when the clutch and
primary chain are in position.
Fit the clutch on the gearbox mainshaft (this does not
apply after decarbonising) see re-assembly of
clutch, page 22 and replace the chain. On
fastening the spring link it is important that it should
be fixed so that the closed end is pointing in the
direction of the “run” of the chain.
When replacing the chaincase outer cover, make
sure that the washers, etc.. on the footrest bar are in
the correct position (see Fig. 25) and that the jointing
washer is properly fitted. The chaincase must be
refilled with engine oil to the level plug, before the
machine is used.
If there is any suspicion that the rubber pipes from
the oil tank to the crankcase are faulty they should be
replaced, otherwise the engine may suffer harm from
insufficient oil. Note that in later models, the oil pipes
are metal with a short rubber insertion.
All the control cables (i.e., carburettor, magneto and
exhaust valve lifter) should be re-coupled next,
followed by the dynamo leads and the earth wire.
Finally, replace the petrol pipe and then the exhaust
pipe and silencer.
19

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