Clutch sprocket 4 spring clutch.
43 T, single chain, size: 1/2 X 5/16 – 428 – 110046
BSA A&B Group swinging arm models (1958 onwards) with 4 spring clutch
Triumph Pre-Unit 500/650cc Twins models with 5 plate clutch
Part numbers: 57-1549, 42-3266
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