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Zenith Motorcycles

Zenith Motorcycles for the 1920/1921 Season

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Zenith Flat Twin 1920

A sporting model Zenith fitted with the Bradshaw flat twin engine is one of the real novelties of the Show. Note the unusual crank-case construction.

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Zenith Technicalities 1920

Delicate clutch manipulation is made possible on the Zenith by means of an exceptionally long pedal.
Troughs to carry water to the rear are provided on the Zenith back mudguard (shown detached)

The 1920 Olympia Show.

ZENITH. (Stand 87.)

  • 3½ h.p. Bradshaw; 68x68 mm. (499 c.c); horizontal twin-cylinder four-stroke; overhead valves; mechanical lubrication; B. and B. carburetter; gear-driven magneto; Zenith-Gradua gear; belt drive; Avon 26x2-¼ in. tyres. Price (provisional) £130.

Zenith Motors, Ltd., Hampton Court.

Probably the greatest attraction on the Zenith stand is the new Bradshaw engine sporting machine. The engine of this may be regarded as the first attempt at really scientific oil-cooling. As has already been described in The Motor Cycle, the cylinders are sunk inside the crank case, only the heads being exposed. The forced-feed lubrication pump provides a constant stream of oil from a separate tank in which it is kept cool, and the cylinders and pistons are cooled as well as lubricated by this oil, which is then returned by a second pump from the crank case into the oil tank. The preliminary tests of the model (which will not be in production until February) show it to be possessed of a very good turn of speed as well as pulling power, and it will certainly become immensely popular with those who prefer a sporting solo machine of high performance.

  • 2¾ h.p.; 58¼ x 65 mm. (346 c.c); two-cylinder flat twin four-stroke; side-by-side valves; hand pump lubrication; Amac carburetter; gear-driven magneto; Zenith Gradua gear; chain and belt drive; 26in. x 2¼ in. tyres. Price £107.

This light sporting model remains practically as it was, it having been found so fully up to its work that no alteration is needed. It is a fascinating solo mount, and makes a great appeal to those who find that 350 c.c. gives them the performance they require.

  • 5 h.p.; 70x85 mm. (654 c.c); cylinder V twin four-stroke; side-by-side valves; hand pump lubrication; Amac carburetter; chain-driven magneto; Zenith Gradua gear; belt drive; 650x65mm. tyres. Price £123.

This model, also the heavier sporting models "E" with 6 h.p., and "G" with 8 h.p., engines (both of which are priced at £139), resemble the 2¾ h.p. flat twin, in being practically unaltered; they are too well-known to need further description. It should be added, however, that improvements have been embodied in details, particularly in the direction of mudguarding. The 8 h.p. clutch model with countershaft, which is priced at £162, has a new and excellently arranged clutch pedal of very long leverage, with a ratchet pawl to hold the clutch out it desired.

Olympia Show, 1920

The Motor Cycle, December 2nd, 1920.



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