BSA V-twins

V-twins
The BSA Model E was a British V-twin motorcycle manufactured by Birmingham Small Arms Company (BSA) at their factory in Armoury Road, Small Heath, Birmingham from 1919. It was often used with the matching BSA sidecar.

Development
After having been turned over to weapons production for World War I, BSA returned to producing motorcycles again which were sold as affordable with reasonable performance for the average user. BSA stressed the reliability of their machines, the availability of spares and dealer support. The BSA Model E was the first of a series of successful V-twins based around the reliable 770cc side valve engine with cylinders at an angle of 50 degrees. The modest 6hp produced by the engine was able to provide a top speed of 55mph and it had BSA's own design of three speed gearbox with the drive chain enclosed in an aluminium casing. There was an increased demand for affordable transport after the end of the war and the Model E became popular with BSA's matching green and cream painted sidecar option. Designed for easy servicing the valves were interchangeable and had quickly adjustable tappets. The constant loss oil pump was supplemented by a hand operated pump and the wheels were also quickly detachable and the same size so that they were interchangeable. Although the BSA Model E was produced until 1924 it had been largely replaced by the more powerful 986cc Model F in 1922, which continued in production as the BSA Model G, with continual modifications, until just after the outbreak of World War II.
V-Twins BSA Model:

Model	Engine	First year	Last year	Notes
Model E	771 cc	1919	1924	side-valve V twin
G30-G35	985 cc	1930	1935	side-valve
G14	985 cc	1936	1940	side-valve
J34, J35, J12	499 cc	1934	1936	overhead valve
Y13	748 cc	1936	1938	overhead valve