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BSA CB/DB Goldstar 350cc Piston 040
72 mm
Piston Clearance 0.12mm or 45thou
BSA Piston 250cc C10/C11/C11G/C12 +040 = 64 mm
BSA/Triumph/AMC Ball Bearing 6205
Triumph/BSA Ball Bearing Crankshaft
BSA Engine Sprocket B31,B32,B33,B34,Gold Star.M20.M21.M33/ 23T. 4-Lobe
BSA B40 piston +20