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 but they were really developments of the older pre unit a7 a10 model range with less weight. The a7 and a10 models were semi unit 500 cc 1947 1962 bsas first parallel twin called flash in the us after 1954 a7s star twin 500 cc 1949 1954 tuned version of the a7 a7ss shooting star 500 cc 1954 1962 tuned a7 in swinging arm frame a10 golden flash 650 cc 1950 1962 bsas first 650 cc parallel twin known as royal tourist in the . List of bsa motorcycles this is a list of british manufacturer birmingham small arms company bsa motorcycles from the 1930s until the end of the marque in the 1970s the list is tabulated by engine type and period. Bsa 500 650 unit twins parts books 1962 1972 bsa bsa unit twins where produced from 1962 1972 each parts book includes export models aka american models which include some of the following models lightning rocket wasp firebird scrambler spitfire hornet royal star etc. Bsa 500 650 twins the essential buyers guide peter henshaw on amazoncom free shipping on qualifying offers sometimes living under the shadow of the flashier high profile triumph twins the equivalent bsas were just as numerous
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