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| Manufacturer | Williamson Motor Company |
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| Production | 1912-1920 |
| Engine | 964cc water-cooled twin |
| Wheelbase | 60.5 inches (154 cm) |
The Williamson Flat Twin was motorcycle made in Coventry, UK by William ('Billy') Williamson, who had been managing director of the Coventry-based Rex company. He teamed up with William Douglas (ofDouglas Motorcycles to develop new prototype motorcycles under the name Williamson-Douglas and employed Billy's brother Harold as a test rider. Douglas had been developing a 964 ccwater-cooled flat twin engine that could be used either for light cars or motorcycles. Billy Williamson fitted this engine into a frame with Douglas-Druid girder forks and a Douglas two-speed gearbox and a foot-operated clutch which was launched in 1912 at a cost of £82. In 1913 an air-cooled version was added to the range and in 1914 a kick starter was added. Production was halted by World War I and in 1919 the only engines available were JAP 980 cc air-cooled side valves, so Williamson redesigned the frame to fit. Unfortunately Billy Williamson suffered a fatal heart attack in 1920 after only twenty motorcycles had been produced.[1]
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| Preceded by | Fastest production motorcycle 1913–1914 |
Succeeded by |
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