1971 BSA B25T Gold Star Though over the years BSA has made parallel twins and V twins, even transverse triples, the single cylinder engine was a mainstay power-plant. 250cc and 500cc class machines served well as street bikes but as racers maybe even better. The Gold Star and later B50 500 singles performed in trials, motocross and road race. In the 1960’s Jeff Smith brought home several motocross championships on a variety of scrambles and MX models. Earlier, in 1954 on the beach course, BSA to