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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 ...
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]
Also in 1954, Ariel launched the FH, a 650cc parallel twin to compete with the Triumph Thunderbird. However, instead of enlarging the KH engine, Ariel used the BSA A10 engine, with a different timing cover to badge-engineer it as an Ariel. [12] Reliable and capable of 100 miles per hour (160 km/h), the FH proved popular with sidecar enthusiasts.
650 cc parallel twin called the "Huntmaster" with BSA A10 engine Ariel 350 cc HT3 1954 Trials special with competition frame Ariel 500 cc HT 1954–59 Trials special with competition frame Ariel LH 1954–58 200 cc OHV Ariel Colt Ariel Leader: 1958–65 250 cc two-stroke: Ariel Arrow: 1959 250 cc sports version of Ariel Leader Ariel Golden ...
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 .
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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.