BSA M20

The BSA M20 is a British motorcycle formerly made by Birmingham Small Arms Company (BSA) at their factory in Small Heath, Birmingham. Although initially viewed as a near failure by the War Office in 1936, the M20 evolved into one of the longest serving motorcycles in the history of British military motorcycling, as well as becoming the most numerous type produced for World War II with 126,000 in active service. Many are still in use around the world today.

BSA M20 / M21
ManufacturerBirmingham Small Arms Company
Production19371955
Engine496cc single cylinder side valve 4 stroke
Bore / stroke82 mm × 94 mm (3.2 in × 3.7 in)
Power13bhp @4,200 rpm
Transmission4 Speed / chain
Fuel capacity3 gallons
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