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BSA Shooting Star (B-31)

Make & Model Family

The BSA B-31 is a motorcycle that was produced by Birmingham Small Arms Company.


The BSA B-31 is a motorcycle that was produced by Birmingham Small Arms Company.

The BSA B-31, 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 348 cc (21.2 cubic inches). Initially, it had a rigid frame and telescopic forks, the first use of such on a BSA. It developed about 15 HP, adequate for the roads of the day and enough to deliver a top speed of around 70 M.P.H.. There was a competition kit available for the original rigid model B-31 and B-33. It was immediately popular and was soon joined by a 500 cc (31 cubic inch) version, the BSA B-33 and competition equivalents, the BSA B-32 and BSA B-34; the side-car version, with stiffer suspension and different final demultiplication, was known as BB-31.

Plunger rear suspension was offered later, with a swingarm rear suspension frame available from 1954. The model continued in production until 1959, by which time the traditional Lucas magdyno had been replaced by an alternator and coil ignition.

The B series expanded through its life to include the famous BSA Gold Stars, and the bottom half of all engines has much in common with the M series side valve models. The M-33, designed for sidecar work, combined the strong M series frame and the better-performing B-33 500 cc overhead valve engine.

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