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
Spares List Matchless 1956 350cc and 500cc. Single Cylinder copy Touring Trials and ScrambleModels 350 G3LS Spring Frame (Touring) 350 G3LCT Spring Frame (Competition) 350 G3LCS Spring Frame (Scrambles)