BSA B31 Gallery

Year
Bike
Picture
Description
1940
BSA B31
B31
Re-registered 2004, previously used as a rigid trials bike. Frame is M20 number WM20-19081, Engine is ZB31 number ZB31-14339.
1946
BSA B31
1946 BSA B31
1946
BSA B31 Rigid
1946 BSA B31
1947
BSA B31
1947 BSA B31
Based on the pre-war B29 BSAs rugged and reliable, the B31 was manufactured from 1945 - 59. It's over-head valve engine provides the basic for the renowned Gold Star. This B31 was first registered on 9th May 1947 but over the years it has been changed from it's original specifications and now houses a 1948 B33 engine of 499cc.
1947
BSA B31
1947 BSA B31
1949
1949 bsa b31
bsa b31 1949
The BSA B31, introduced in 1945, was the first new model introduced by the company after the Second World War. Based on pre-war designs, it used a single cylinder four stroke engine that displaced 348cc. Initially, it had a rigid frame and telescopic forks, the first use of such on a BSA. It developed about 17bhp, adequate for the roads of the day and enough to deliver a top speed of around 70mph. It was immediately popular and was soon joined by a 500cc version, the BSA B33 and competition equivalents, the BSA B32 and BSA B34.
1949
1949 bsa b31, 350cc
bsa b31, 350cc 1949
1945-59, 348cc, ohv single, 365lb, 80mpg, 75mph. Basic but robust engine in pre-war rigid chassis fitted with telescopic forks. 1949 plunger suspension was fitted giving slightly more control. 1954 a swinging arm frame was fitted. Leaky and noisy with poor starting. The early rigid or plunger frame models are desirable.
1949
BSA B31
1949 BSA B31
1949
BSA B31
1949 BSA B31
It has an unsprung rear wheel and this makes it rarer and more desirable.
1950
BSA B31
BSA B31 Trials
Rigid framed B31 trials Iron
1950
BSA B31 350cc Plunger
BSA B31 350cc Plunger
1951
1951 bsa b31
bsa b31 1951
1951
1951 bsa b31
bsa b31 1951
1951
BSA B31 Plunger 350cc
BSA B31 Plunger 350cc
1951
BSA B31 Raser
BSA B31 Raser
1951
BSA ZB31
1951 BSA ZB31
1951
BSA ZB31
1953 BSA ZB31
350cc
1952
BSA B31
B31
1953
1953 bsa b31
bsa b31 1953
1953
BSA B31 Plunger Frame
B31 Plunger Frame
1954
1954 bsa b31
bsa b31 1954
1954
1954 bsa b31
bsa b31 1954
1954
1954 bsa b31
bsa b31 1954
1954
BSA B31
1954 BSA B31
1955
1955 bsa b31 350 gold star replica
bsa b31 350 gold star replica 1955
1955
1955 bsa b31, 347cc
bsa b31, 347cc 1955
1955
BSA B31
1955 BSA B31
1956
BSA B31
1956 BSA B31
1956
BSA B31
1956 BSA B31
1956
BSA B31
1956 BSA B31
1957
1957 bsa b31, 350cc
bsa b31, 350cc 1957
1957
BSA B31
1957 BSA B31
1957
BSA B31 Goldie
BSA B31 Goldie
1958
bsa 1958 b31 alternator
bsa 1958 b31 alternator
1959
BSA B31
1959 BSA B31
1972
BSA B25SS
B25SS