The BSA A65 Star was a

Birmingham Small Arms Company The Birmingham Small Arms Company Limited (BSA) 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 tool, hand, po ...

(BSA)

motorcycle A motorcycle (motorbike, bike, or trike (if three-wheeled)) is a two or three-wheeled motor vehicle steered by a handlebar. Motorcycle design varies greatly to suit a range of different purposes: long-distance travel, commuting, cruising ...

aimed at the US market for

unit construction : ''For the vehicle design where the vehicle's skin is used as a load-bearing element, see Monocoque.'' Unit construction is the design of larger motorcycles where the engine and gearbox components share a single casing. This sometimes includes ...

twins Twins are two offspring produced by the same pregnancy.MedicineNet > Definition of TwinLast Editorial Review: 19 June 2000 Twins can be either ''monozygotic'' ('identical'), meaning that they develop from one zygote, which splits and forms two em ...

. 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. A range of A65 Star twins was produced between 1962 and 1972.

Development

The decision by

Luca The last universal common ancestor (LUCA) is the most recent population from which all organisms now living on Earth share common descent—the most recent common ancestor of all current life on Earth. This includes all cellular organisms; th ...

s in the late 1950s to switch production of motorcycle electrical components (from magneto/dynamo systems to alternators/coil systems) forced British motorcycle manufacturers to completely redesign their engines.

Triumph The Roman triumph (Latin triumphus) was a celebration for a victorious military commander in ancient Rome. For later imitations, in life or in art, see Trionfo. Numerous later uses of the term, up to the present, are derived directly or indirectl ...

and BSA took the opportunity to move from pre-unit and semi-unit construction to full unit construction, that is, with the engine and gearbox together in an integrated casting. At the same time, Bob Fearon, managing director and general manager of BSA, recognised the need for a new look that built on the best features of the A10s but would succeed in the potentially lucrative, but competitive, US market. Working with chief development engineer Bert Perrigo, he developed the unit construction ''Star twins''. A range of these Star twins were produced between 1962 and 1972, and improved on the old pre-unit A7 and A10 series, being lighter and easier to manufacture, with more up to date styling. Not enough time was spent on testing and development as BSA were struggling to remain competitive with Triumph models and the emerging Japanese motorcycles. Large side panels were fitted to cover the space behind the engine but they contributed to a dated look. This was reinforced by engine vibration, but acceleration was good to a top speed of . BSA Spitfire 1

Twelve volt electrics were introduced in 1966 and the top of the range

BSA Spitfire The BSA Spitfire is a high-performance BSA motorcycle made from 1966 to 1968 with model designations of MkII, MkIII and MkIV. Announced at the Brighton motorcycle show held during September 1965, it was based on the earlier BSA Lightning with a ...

with a claimed top speed of . In 1967 BSA won a special Queens Award to Industry and by 1969 80% of the BSA factory production was going to America. In the US the 650 Star twins were selling well with styling changes including high rise handlebars and more streamlined fuel tanks. In 1970 a new 'oil in frame' design was adopted but this proved unpopular with shorter riders, as it increased the seat height. This was sorted out by 1972 but by then BSA were facing serious financial problems and stopped production of the outdated 650 Star twin.

References

{{DEFAULTSORT:Bsa A65 Star A65 Star Motorcycles introduced in 1962 Motorcycles powered by straight-twin engines

Development

See also

References