JES motorcycles were produced from 1909 to 1924. The name came from
the initials of J. E. Smith of J. E. S. Motor Works of Gloucester.
1909 JES was first offered as an auxiliary motor set to fit within
a bicycle frame and drive the rear wheel by belt. The engine was a 1hp,
116cc four-stroke with a front-mounted gear-driven Fischer
magneto, and the whole machine was a bicycle with braced forks and a fuel
tank hung from the top tube.
The JES continued in this form for many years and was also built
and listed as the City
and the Imp.
1913-1917 For a list of the models and prices of motorcycles see the 1917
1920 The engine was enlarged to 142cc and inclined in the frame, but the
original simple concept remained.
1921 Added to the list was a 170cc two-stroke miniature motorcycle with
two speeds and a vertical engine.
1922 A single-speed version appeared.
1923 The four-stroke was dropped, but the single-speed two-stroke ran on
with a three-speed version. To these were soon added a lightweight with
four-speed chain-transmission and the choice of 247cc two-stroke or 249cc
ohv Blackburne engines
- a move to more conventional machines.
1924 The company acquired the Connaught
marque of Birmingham, and for that year there were just two lightweight
models. One with the 247cc two-stroke, but the other with a 348cc sv engine.
Both had three-speed Burman gearboxes
and chain-cum-belt drive. The auxiliary motor set was re-introduced. This
was a 123cc two-stroke engine, chain drive and in either gents' or ladies'
style of bicycles frame. It was also available as a conversion kit. The
make did not survive beyond the end of that year.