Duzmo is a British historical brand of motorcycles.

The company name was John Wallace, Portable Tool & amp; Engineering Co. Ltd., later Cedar Road Works, London.

After the First World War, John Wallace designed a pure sports engine with a 492cc single cylinder head engine with a detachable cylinder head, aluminum piston and pressure lubrication. This machine still had direct belt drive from the crankshaft and arrived in the market in 1919. He was produced by the Portable Tool and Engineering Co. in London.

In 1920, an 8pk V twin with a 50 ° block angle, which was actually a double-cylinder, had to measure approximately 984 cc. However, the company sold the production rights back to Wallace, which continued its business, but got help from his friend, the top engineer Bert le Vack.

In 1921 the engine was changed and in the autumn of that year the V-twin went into production. There was now full chain drive with Sturmey-Archer gearbox, but customers who appreciated it could still order a direct belt drive without acceleration.

In 1923, Le Vack left for JAP and interest in Duzmo motorcycles began to decline. Only the one-cylinder was still produced.

A renewed frame appeared in 1924 and the engine was now lightly built. The machine now also got a three-speed gearbox and full chain drive, but Wallace went bankrupt. The Duzmo cylinders were built for some time by D. J. Shepherd and Co. in Enfield Highway. Trivia

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