In 1921, BSA executives decided to try their production capacity in competitions, putting up the six best motorcycles for racing. But the company was waiting for a terrible fiasco. Not a single car reached the finish line - their pistons simply melted.
BSA 500 & 650 Unit Twins Parts Books (1962-1972) BSA BSA Unit Twins where produced from 1962-1972. Each parts book includes 'export' Models A.K.A. 'American models' which include some of the following models; Lightning, Rocket, Wasp, Firebird Scrambler, Spitfire, Hornet, Royal Star, etc. Parts 500, 650, 750: BSA 1965 – 1969. 500 and 650 A50. And A65 Shop and Service Manual. 1966 Parts Book. 1971 Service Manual. BSA 500, 650, 750. BSA 650 Parts Book. 1948-1960 A7 Service Sheets. BSA pre-unit bikes. Printed 1948-1960.
Work continued, and the forerunner of future success was the acquisition of Daimler. Excellent specialists came to the BSA, including design engineer Harold Briggs. He developed a small motorcycle with an engine capacity of 350 cubic centimeters, the maximum speed of which was up to 120 kilometers per hour. Its feature was the bottom valves.
Another engineer, Harry Poole, was involved in the Model B machine, nicknamed the 'round tank.' The Model B motorcycle was very popular in Germany. Over the entire existence of the brand, about 35,000 copies were sold. But the best BSA bike of those times was considered a motorcycle called Slouper. It was equipped with a slightly tilted forward engine of 500 cubic meters with a single top valve. It was first launched in 1927.