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The BSA A10 series was a range of 646 cc (39.4 cu in) air-cooled parallel twin motorcycles designed by Bert Hopwood and produced by Birmingham Small Arms Company at Small Heath, Birmingham from 1950 to 1963.
BSA motorcycles were made by the Birmingham Small Arms Company Limited (BSA), which was a major British industrial combine, a group of businesses manufacturing military and sporting firearms; bicycles; motorcycles; cars; buses and bodies; steel; iron castings; hand, power, and machine tools; coal cleaning and handling plants; sintered metals; and hard chrome process.
AJS racing motorcycle showing typical pre-unit construction engine and gearbox layout with mounting plates, slotted holes and screw-thread adjusters visible. Pre-unit construction, [1] also called separate construction, is a motorcycle engine architecture where the engine and gearbox are separate components with their own oil reservoirs, linked by a driving chain within a primary chaincase.
A10 Golden Flash: 650 cc 1950 1962 BSA's first 650 cc parallel twin. Known as "Royal Tourist" in the US from 1960 A10 Super Flash 650 cc 1953 1954 Limited edition for homologation for production racing in the USA A10 Road Rocket: 650 cc 1954 1957 Tuned version of "Golden Flash" A10 Spitfire Scrambler 650 cc 1957 1963 Tuned off-road racer (US only)
The BSA unit twins were a range of unit construction twin-cylinder motorcycles made by the Birmingham Small Arms Company (BSA) and aimed at the US market. A range of 500 cc (31 cu in), 650 cc (40 cu in) and 750 cc (46 cu in) twins were produced between 1962 and 1972, [1] but they were really developments of the older pre-unit A7/A10 model range with less weight. [2]
The BSA Road Rocket was a 1950s 646 cc (39.4 cu in) air-cooled parallel twin motorcycle designed by Bert Hopwood and produced by Birmingham Small Arms Company (BSA) at Small Heath, Birmingham. Developed from the A10 Golden Flash it was the first sports bike in the BSA A10 series .
Parallel twin. Predates the "Turner Twins". Scrapped when Turner came in, the design later resurfaced, modified, as the BSA A10. 2H, 2H, 3S, 3SC, 3SE, 3H, 5H, 6S, 1937–1940 Tiger 70 249 1937–1940 OHV single Tiger 80: 349 1937–1940 OHV single Tiger 90 497 1937–1940 OHV single 5T Speed Twin: 498 1937-40,1946–58 parallel twin, OHV Tiger ...
Early Golden Flash A10s had frames with either no rear suspension, or plungers, and had a semi-unit engine and gearbox, with the gearbox bolted to the rear of the engine. The A10 was increased to 650 cc (40 cu in), with a revised alloy rocker box and cast-iron cylinder head, plus an integral manifold for the single Amal carburettor.