BSA ENGINE SPROCKET 21T 15-1560 M20 M21 M33 B31 B32 B33 B34 A7 A10

This is a brand new engine sprocket 4 lobe, 21 teeth.

Fits: BSA M20, M21, M33, B31, B32, B33, B34 and Goldstar

Part # 15-1560