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 348 cc (21.2 cu in). Initially, it had a rigid frame and telescopic forks, the …

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2013年7月10日 · The engine and gearbox lived up to BSA’s reputation for durability, needing nothing more than the usual rebore/piston and a complete set of bearings. The big-end was a specialist job because of the realignment requirements, but at least it’s straightforward with a simple bolted-up crankpin.

The 499cc "all iron" BSA B33 arrived in 1947. It was based upon the 1945 348cc B31 which was derived from the pre-WW2 OHV BSA pre-unit singles. Outwardly identical to the B31, the B33 featured a slightly larger carburettor, heavier flywheels and a larger rear tyre. The first B33s were built around rigid frames.

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.

2013年10月23日 · BSA B31 350cc single . From the restorer’s point of view, the big advantage of a bike such as BSA’s daily-workhorse 350cc B31 single, is that it remained in produc­tion for so long – modified over the years, naturally, but not to any significant degree – that parts are still relatively easy to obtain; even for a 1946 example, as seen here.

2022年1月5日 · BSA’s B31 is unusual in the classic world, in that there wasn’t really much of a gap between it being ordinary workaday transport and it becoming a classic worthy of restoration and loving care. Many a B31 has rumbled on, refusing to break, for years.

2016年1月13日 · The 1949 BSA B31 has at its heart an air-cooled, four-stroke, 348cc, single cylinder powerhouse mated to a four-speed manual transmission that can produce a claimed 22 horsepower at 6000 rpm.

2024年4月19日 · Specifications: 1952 BSA B31. Engine: OHV single. Cast iron barrel and head with light alloy rocker covers. Gear-type oil pump. Bore x stroke: 71mm x 88mm Capacity: 348cc Carburettor: Amal Type 6 with remote bowl Ignition: Lucas Magdyno, gear-driven Transmission: 4 …

2023年8月29日 · BSA’s first new model after WWII, the B31 was a single-cylinder four-stroke designed to be used as basic transport. The 17 horsepower engine was sufficient to get the bike up about 70 miles per hour.