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The Norton 650SS is a 650 cc (40 cu in) vertical twin motorcycle made by Norton Motorcycle Company from 1962 to 1967. The 650SS was based on the Norton Manxman.

Norton 650SS Dominator
1968 650SS
ManufacturerNorton Motorcycles
Production1962–1967
SuccessorNorton Mercury
Engine646 cc (39.4 cu in) overhead valve, air-cooled parallel twin
Top speed110–115 mph (177–185 km/h)[1][2]
Power49hp @ 6,800rpm[2]
TransmissionFour-speed, chain final drive
BrakesDrum brakes
Weight198kg (434lb) (wet)

The machine was capable of 110–115 mph (177–185 km/h).[1][2] SS stood for Sports Special. Norton discontinued its 600 cc models to concentrate on production of the 650SS, which quickly gained a reputation as the "best of the Dommies"[attribution needed].[3]


Development


A 650SS converted into a café racer
A 650SS converted into a café racer

Norton produced a 650 in 1961 for export only, which was sold in the US as the Manxman. It was finished in polychromatic blue and a bright red seat with white piping and much chrome plate, and a special exhaust system only fitted to the Manxman.[4] The Manxman 650 twin produced 52 bhp, giving it a top speed of more than 120 mph (190 km/h). A race machine developed by Heinz Kegler had speeds of 150 mph (240 km/h) and won pebble beach races.[5] Initially production was at Norton's Bracebridge Street, Birmingham factory, but following the factory's closure in 1963, production was transferred to parent company AMC's works in Plumstead, London.[6]

A European styled version of the Manxman was shown in early 1962 at the Amsterdam International Auto Show and went on sale in April that year as the 650SS.[6] The machine had twin Amal Monobloc carburettors with the intakes angled downwards. Twin exhausts replaced the 99SS two-into-one and the headlight nacelle was replaced with a separately mounted speedometer and tachometer. The 650SS was finished with a black frame with silver fuel tank and optional chrome fenders.[5]

In February 1962 Motor Cycling magazine achieved a best one-way speed of 119.5 mph (192.3 km/h) at MIRA with a 650SS. This was more than 10 mph (16 km/h) faster than the rival Triumph Bonneville tested the previous summer.[7]


References


  1. Reynolds, Jim (1990). Best of British Bikes. Patrick Stephens Ltd. p. 99. ISBN 978-1-85260-033-4.
  2. Brown, Roland (2006). The Ultimate History of Fast Motorcycles. Bath: Parragon. pp. 214–215. ISBN 978-1-4054-7303-3.[page needed]
  3. Kemp, Andrew; De Cet, Mirco (2004). Classic British Bikes. Bookmart Ltd. ISBN 978-1-86147-136-9.
  4. "Norton Manxman". Cycle World: 8–11, 44. March 1962.
  5. Smith, Robert (January–February 2007). "The Norton 650SS". Motorcycle Classics. Archived from the original on 1 May 2009. Retrieved 13 August 2009.
  6. Scaysbrook, Jim (9 April 2021). "Norton 650SS: Norton's top twin?". Old Bike Australasia. Retrieved 1 July 2021.
  7. "1967 Norton Dominator 650SS Frame no. 123113 Engine no. 123113". Bonhams. Retrieved 2 July 2021.


Media related to Norton 650SS at Wikimedia Commons



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