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BSA/Triumph Piston B25 & TR25 Std.
Bore: 67mm
Piston Clearance 0.12mm or 45thou
comp. ratio 9.25:1
BSA Transfer for Tank/Headstock/Toolbox to 1953
BSA Gearchange Rubber for A,B,C,M Models
BSA Piston 250cc C10/C11/C11G/C12 +040 = 64 mm
BSA Transfer Tank 1933/39
BSA Tank Transfer 1937/38