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Tooth was a motorcycle produced in 1914 by J. N. Tooth, of Humber Road, Coventry.
This was an experimental lightweight machine, described in August 1914. The engine was 50.5 cc, with a rotating sleeve, driven by bevel gears at half engine speed. The sleeve was in two sections that revolved between the cylinder proper and to allow the mixture to enter and exit the cylinder proper and a finned outer cylinder. Both had inlet and outlet ports that were regisered in turn with a single one in the top rotating sleeve.
The engine was mounted ahead of the bottom bracket of a bicycle and drove the rear wheel by a crossed round belt.
Although the machine ran well, its arrival coincided with the outbreak of World War I, and nothing more was heard of it.