Description
BSA launched the first Model E in 1920 with a 50-degree, side-valve, V-twin engine of 770cc fed by an Amac carburettor and with both exhaust pipes directed forward to a collector/ silencer mounted below the front of the engine. The powertrain included a three-speed, hand-change gearbox and both the primary and secondary drive chains were fully enclosed in aluminium cases. The brakes, front and rear, were of the 'dummy belt rim' and rubber block type derived from earlier belt-driven motorcycles. The frame featured cantilever fork front suspension and sidecar mounting lugs. The fuel tank was flat-sided. Engine power was rated at 6hp and the side-valve mechanism was exposed.
The Model E then evolved along with mainstream motorcycle technology so that the valve-train became enclosed, the exhaust system featured a Brooklands-style fishtail, the brakes were changed to the internally-expanding type, girder front forks were added and electric lighting replaced the earlier acetylene system.
The machine is fitted with BSA's own three speed gearbox, internal expanding brakes, drip feed oil pump, Lucas magneto dynamo and brass Amal carburettor. Further equipments include complete electrical Lucas lighting set, Battery carrier Toolbox and Terry spring seat.
The BSA is in a running condition, video on request.
