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Norton Commando
:''Distinguish from Norton Commander (motorcycle).''
The Norton Commando was a British Norton-Villiers motorcycle with an OHV pre-unit parallel-twin engine, produced by the Norton Motorcycle company from 1967 until 1977. Initially having a nominal ''750 cc'' displacement, actually , in 1973 it became an ''850 cc'', actually . It had a hemi-type head, similar to all OHV Norton engines since the early 1920s.
During its ten years of production, the Commando was popular all over the world. In the United Kingdom it won the Motor Cycle News "Machine of the Year" award for five successive years from 1968-1972.〔(Norton Commando, A Short History )〕 Given that its engine was an old pre-unit design, even Norton's chairman, Dennis Poore, expressed surprise at the Commando's remarkable success.〔Motor Cycle News, 1972〕
==Background==
The origins of the Norton Commando can be traced back to the late 1940s when the Norton Model 7 Twin was designed by Bert Hopwood. The twin-cylinder design evolved into 600 cc, then the 650 cc ''Manxman'' and Dominator until superseded by 750 cc Atlas before being launched as the 750 cc Commando in 1967. As well as having a radical new frame, the Commando's engine (which was mounted vertically in earlier models) was tilted forward. This was relatively easy as the engine was "pre-unit", that is, the gearbox was not integral with the crankcase, and the change gave three benefits: (i) the centre of gravity was moved further forward; (ii) this allowed more space behind the carburettors for the airbox; and (iii) it gave an attractive raked appearance to the motorcycle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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