BSA Piston M20 +040. 83.0mm complete with circlips and gudgeon pin 82mm +040 (=83mm) Piston Clearance 0.12mm or 45thouThese pistons now come with 4 piston rings. You can also use them only with 3 piston rings.measurements second picture or techn. dataincluding gudgeon pin, circlips and piston rings
AJS/Matchless Piston 497 cc. 1956- OHV. 18CS/G80CS STD STD= 86 mm
CR 8.7:1Measurements see last picture pleaseJPincluding gudgeon Pin, piston rings and circlipsPiston Clearance 0.12mm or 45thouPlease view ALL Pictures
Clutch Locking Plate Triumph/BSA 3-and 4-spring Clutches
single cylinder 1937-1945
Twin cylinder 137-1988
not to be used for single cylinder Triumph and BSA Unit engines