BSA B31 Piston Complete Std.71 mm Diametermore measurements see last pict.including gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thou
BSA B31 Piston Complete +06071 mm = STD Diameter+060= 72.5 mmmore measurements see last pict.including gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thou