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A10 engine (1958 Golden Flash) Launched in October 1949, Hopwood's A10 Golden Flash drew heavily from the A7 design by Page and Bert Perkins. [5] The A10 was increased to 650 cc (40 cu in) by using a 70mm bore and 84mm stroke. [1] It had a revised alloy rocker box and cast-iron cylinder head, plus an integral manifold for the single Amal ...
The BSA Golden Flash, commonly referred to as the Gold Flash, [4] was a 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. The Golden Flash was the first model in the BSA A10 series. It was available in black and chrome; but it was the ...
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 .
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 Rocket Gold Star (RGS) was a 646 cc (39.4 cu in) air-cooled parallel twin motorcycle produced by Birmingham Small Arms Company (BSA) at Small Heath, Birmingham. Launched in February 1962, it was one of the final range of A10 twins , using a tuned A10 Super Rocket engine in the double-downtube Gold Star frame.
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The Kawasaki W1 is based heavily on the post-war, pre-unit construction, 500cc vertical-twin BSA A7 design inherited from Meguro, but as time passed, the Kawasaki and BSA designs diverged. [14] The BSA engine has a 70 mm (2.8 in) bore and 84 mm (3.3 in) stroke , whereas the W1 inherited its 72.6 mm (2.86 in) stroke from the K2 engine, adding ...