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In October 1949 BSA launched the Bert Hopwood designed 650 cc twin cylinder A10. The engine in the A10 was a redesigned and improved version of the A7 engine. A 497 version of the redesigned engine was produced for the A7. Initially fitted in the new A7S Star Twin, it was also fitted to the base A7 model in 1951.
1962 Rocket Gold Star. The Rocket Gold Star was introduced in 1962, using a tuned Super Rocket engine a Gold Star frame. [36] Gold Star tuner and dealer, Eddie Dow, had a customer that wanted to be supplied with a Gold Star fitted with a Super Rocket engine. BSA supplied a Gold Star less engine and a separate Super Rocket engine.
Sometimes called "Star Twin". Called "Royal Star" in the US A65R Rocket 650 cc 1964 1965 Sports model with 9:1 compression, separate headlight, and sports mudguards. Known as "Thunderbolt Rocket" in the US A65T Thunderbolt 650 cc 1966 1972 Single carburettor. From 1971 had oil-bearing frame A65L Lightning: 650 cc 1964 1972 Twin carburettors.
The BSA A65 Star was a Birmingham Small Arms Company (BSA) motorcycle aimed at the US market for unit construction twins. As well as giving a clean look to the engine, with the pushrod passages part of the cylinder block casting, unit construction reduced the number of places oil could leak from. [ 3 ]
To make the A65R more of a 'sports version' of the original BSA A65 Star (and in anticipation of more stringent noise control legislation) it was given 'siamesed' two-into-one exhaust pipes with a special baffle, as well as chrome plated mudguards and headlight brackets. Able to cruise at 85 mph (137 km/h) and with a top speed of 108 mph (174 ...
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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]