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The Norton Model 7 Dominator was a 500 cc vertical twin motorcycle manufactured by the Norton Motorcycle Company from 1949 to 1955. It was the first of Norton's Dominator range of motorcycles. The engine was designed by Bert Hopwood and was a departure from Norton's previous practice of producing single-cylinder machines.
The 597cc featherbed framed Model 99 Dominator was introduced in September 1955, as a larger capacity version alongside the 500 cc Model 88 version. [3] Due to the increased engine capacity, the 99 had a power output of 31 bhp, partly due also to a higher compression ratio possible with the alloy head introduced a year earlier.
After the Second World War, Norton reverted to civilian motorcycle production, gradually increasing its range. A major addition in 1949 was the twin cylinder Model 7, known as the Norton Dominator, a pushrod 500 cc twin-cylinder machine designed by Bert Hopwood. Its chassis was derived from the ES2 single, with telescopic front and plunger rear ...
Model 7: 497cc twin 1949–1956 First Norton Twin Motorcycle, designed by Bert Hopwood Model 77: 497cc 1950–1952 A rigid framed version of the Model 7, supplied only to the Australian market. Model 77: 596cc 1957–1958 Built mainly for sidecar use Dominator 88: 497cc 1952–1966 Same engine as a model 7 but in a featherbed frame Dominator 99 ...
Model 7 may refer to: the Boeing Model 7, a flying boat; the Remington Model 7, a firearm; the Norton Model 7 Dominator, a motorcycle; the Matchless Model 7, a ...
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The 2nd, and more well known 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 It was based on the Model 7 that it superseded, and was primarily intended for sidecar use.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 ]
Having earlier installed the Dominator twin-cylinder engine of 500 cc and 600 cc, in 1959 Norton put the old single cylinder Model 50 (350 cc) and the ES2 (500 cc) into the Featherbed frame to rationalise production. Using grade A mild steel, the size of this engine determined the space between the top and bottom rails of the full duplex cradle.