1929 500cc OHC Sports G.1.

1929 OHC G1 

Appearance As picture 



Engine - 4.98 h.p. 4-stroke over head camshaft, 84mm. x 90mm. bore and stroke, having a capacity of 498c.c., camshaft totally enclosed and automatically lubricated throughout on dry sump principle, oil circulated by double plunger pump of large capacity to all parts of the engine.

Lubrication - Sight feed mechanical mechanical pump on engine shaft, the oil being pressure feed direct to big end.

Carburettor - AMAC T.T Type.

Tank - 2¼ gallons petrol only, fitted with large quick release filler, enamelled lustre black and lined panel gold, separate oil tank on saddle tube, 1 gallon capacity with auxiliary hand pump incorporated.

Ignition - B.T.H Variable Magneto.

Gearbox - Burman 3-speed, 4-plate clutch and kick starter. Heavy roller chain back and front with shock absorbers on engine shaft and gearbox, Gear ratio close or open at option.

Wheels and Tyres - 26 x 3¼in. W.O., with North British Sports Cord Tyres.

Frame - Weldless steel tubing, heavy type spring girder (round tube) forks.

Brakes - 7in. diameter large internal expanding hub front and rear.

Standard Fittings - Leckie patent spring seat, strong steel mudguards with stays, welded steel pannier bag, knee gribs fitted to tank, large plated exhust pipe and silencer.



Sidecar - Coach-built, well sprung, rear locker, apron, windscreen.


New "Saddle" tank design as fitted to the Ivory Twin-Port model.

Additional Information  - (Available to members in downloads section)

  • 1929 Sales Brochure.
  • 1929 Ivory Sales Brochure.
  • Advertisements as published in 1929.
  • 350cc Instruction Book and Spare Parts List.
  • The Motor Cycle, 1929, Road Test of the 350cc Ivory.
  • Motor Cycling, 1929, Road Tests of 350cc Ivory.