The BSA B31 Gallery

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Year Title 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 Rigid 1946 BSA B31
1946 BSA B31 1946 BSA B31

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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 BSA B31 1949 BSA B31

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1949 BSA B31 1949 BSA B31 It has an unsprung rear wheel and this makes it rarer and more desirable.
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 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.

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1950 BSA B31 350cc Plunger BSA B31 350cc Plunger
1950 BSA B31 BSA B31 Trials Rigid framed B31 trials Iron
1951 BSA B31 Raser BSA B31 Raser
1951 BSA B31 Plunger 350cc BSA B31 Plunger 350cc

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1951 1951 bsa b31 bsa b31 1951
1951 1951 bsa b31 bsa b31 1951
1952 BSA B31 B31

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1953 BSA B31 Plunger Frame B31 Plunger Frame
1953 1953 bsa b31 bsa b31 1953
1954 1954 bsa b31 bsa b31 1954

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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

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1955 1955 bsa b31, 347cc bsa b31, 347cc 1955
1955 BSA B31 1955 BSA B31
1956 BSA B31 1956 BSA B31

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1956 BSA B31 1956 BSA B31
1956 BSA B31 1956 BSA B31
1957 BSA B31 1957 BSA B31

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1957 BSA B31 Goldie BSA B31 Goldie
1957 1957 bsa b31, 350cc bsa b31, 350cc 1957
1958 bsa 1958 b31 alternator bsa 1958 b31 alternator
1959 BSA B31 1959 BSA B31

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1972 BSA B25SS B25SS

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