Norton Model 77 Dominator

The Norton Model 77 Dominator was a 600 cc vertical twin motorcycle manufactured by the Norton Motorcycle Company from 1956 to 1958. It was based on the Model 7 that it superseded, and was primarily intended for sidecar use.[2] Norton modified the featherbed frame of the 88 and 99 models in 1957 to be suitable for sidecar use making the Model 77 superfluous and the model was dropped in 1958.[3][4]

Norton Model 77 Dominator
ManufacturerNorton
Production1956-1958
AssemblyBracebridge Street, Birmingham
PredecessorNorton Model 7 Dominator
Engine596 cc (36.4 cu in) air-cooled OHV vertical twin
Bore / stroke68 mm (2.7 in) x 82 mm (3.2 in)
Power31 bhp (23 kW) @ 5,750 rpm
TransmissionWet clutch, 4-speed, chain drive
SuspensionFront: telescopic forks
Rear: swinging arm
Brakes8 in (200 mm) drum front, 7 in (180 mm) drumrear
Footnotes / references
[1]

Technical details

Engine

Based on the 1949 Bert Hopwood designed 500 cc twin engine, the engine had been enlarged to 600 cc by enlarging the 500's bore and stroke of 66 mm (2.6 in) x 72.6 mm (2.86 in) to 68 mm (2.7 in) x 82 mm (3.2 in). The same engine was used in the 99 Dominator.[3][4][5]

Cycle parts

The 77 used the same cycle parts as the previous Model 7,[6] which was also used on the ES2. The single downtube frame was made of tubes and brazed lugs. Front forks were Norton's roadholders.[3][4][5]

References
  1. Reynolds, Jim (1990). Best of British bikes. Patrick Stephens. p. 99. ISBN 978-1-85260-033-4.
  2. Reynolds, Jim (1990). Best of British bikes. Patrick Stephens. p. 97. ISBN 978-1-85260-033-4.
  3. "Norton Dominator". Classic-British-Motorcycles.com. Retrieved 18 June 2021.
  4. "Norton Factory Brochure 1957 - Model 77 600cc Twin". Retrieved 18 June 2021 – via Sheldon's Emu.
  5. Sharkey, Alex (19 March 2021). Classic Bikes: Essential Transport. Character-19.
  6. "Norton Dominator Model 7 1952 497cc 2 cyl ohv". www.classic-motorcycle.com. Retrieved 18 June 2021.
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