BSA D1 125 c.c. Bantam Instruction Manual page 21

To adjust, release the locknut and holding it with a spanner unscrew the
adjusting pin with a screwdriver one or two turns. Still holding the locknut with a
spanner, screw the adjusting pin gently in until it is felt to meet some resistance.
Then unscrew it half-a-turn and holding it in this position retighten the locknut. If the
adjustment is correctly made in this manner, it will be found that there is a small
amount of free play at the clutch lever on the left handlebar before this is felt to take
up the spring pressure during the action of declutching.
F . 8. Clutch control adjustment.
IG
The clutch operating mechanism should be greased at regular intervals to maintain
it in good condition.
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