Gearbox Sprocket Rigid/Plunger 17T. BSA B31/B33
Rigid & Plunger 1946-57
with oil seal
Please see measurements last picture or technical data
Chain 5/8 x 1/4 110-054-.. (520)
1949 to 1958
M20 500 S.V. 1949-1956
M21 600 S.V 1949-1958
M33 500 O.H.V 1949-1957
Made in England