Interesting Facts About the BSA B31
The BSA B31 was a single-cylinder motorcycle produced from 1956 until 1958, when it was replaced by the B40 unit single. It featured a 348cc air-cooled engine and was noted for its value as a British 350cc class machine.
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Short Production Run
The B31 entered production in 1956 and was discontinued in 1958. It was succeeded by the B40 unit single, marking a quick transition in BSA's model lineup.
Engine and Drivetrain
The motorcycle is powered by a 348cc, single-cylinder, air-cooled OHV engine. It is paired with a 4-speed gearbox and utilizes a chain drive system.
Suspension Evolution
The B31 initially featured a rigid frame, but later versions included rear-sprung suspension. Motor Cycle magazine specifically tested the rear-sprung version in 1956.
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BSA B31 Parts
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