BSA Piston NOS 250cc STD 63mm top of the gudgeon pin hole to the top edge of the piston 18.3 mm Gudgeon pin diameter: 5/8"-16 mm Compression hight: approx. 27 mm early BSA -1937 new, old stock
with Gudgeon Pin and Piston Rings Please view all pictures
BSA 250cc
Piston Assembly complete with piston rings, circlips and gudgeon pin
Piston Clearance 0.12mm or 45thou
Compression Height: 25.2mm
C11 1939-55
C12 1955-58
can also be used for C10, even if they usually had a flat top
Measurements see last pict. and techn. data
BSA C11/C11G/C12 Piston +60 Assembly complete with Gudgeon Pin, Piston Rings and Circlips
250cc
Piston Clearance 0.12mm or 45thou
C11 1939-55
C12 1955-58
can also be used for C10, even if they usually had a flat top
measurements see last pict. and techn. data