BSA’s pre-unit twin twin was released in late 1946 for the ’47 model year, initially as the 495-cc A7. In 1950, the A7 500 was joined by its big brother — the 646-cc, A10 650.
The BSA Gold Star 650 is built on a tubular steel frame with a dual-cradle design. Its suspension system includes a 41mm telescopic fork at the front and twin shock absorbers at the rear.