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The Norton Atlas was a Norton motorcycle made between 1962 and 1968, until it was replaced by the Norton Commando.〔 ==Development== The Mark 1 Atlas was launched as the 750SS in the early 1960s, but by the time it appeared c. 1962 it was being called a 750cc Atlas, with Norton's famous featherbed frame. Designer Bert Hopwood’s 1949 497cc Dominator engine had been bored and stroked over the years to 745cc, via 600cc and then 650cc versions, to appeal to the American market and initially was only produced for export.〔''Motorcycle Mechanics'', May 1962, p.13 ''Looking Ahead - Mighty Atlas. "...this exciting 750 cc twin from Norton's.'' () ''Unfortunately, as yet, it is only for the American market, to compete against their hefty capacity bikes.''". Accessed and added 2014-09-20〕 The styling was also aimed at the US market with high-rise handlebars, small 2.5-gallon petrol tank and valanced chrome mudguards and chain guard. The look was completed with a heavy-duty WM3-18 rear wheel, and a Lucas Competition magneto was supplied as standard.〔(【引用サイトリンク】title=1962 Norton Atlas )〕 The engine had lower compression than the Dominator (at 7.6:1) and was fitted with a single 376 Amal monobloc carburettor giving at 6500 rpm. However the design also produced excessive vibration at high revs, so the compression ratio was reduced. The Atlas shared many cycle parts with the last of the Dominator twins and had Norton’s four-speed gearbox and heavy-duty clutch. Electrics were 6-volt and it had Roadholder forks, adjustable Girling rear shocks and a slimline Featherbed frame.〔 In 1964 the Atlas was upgraded to 12-volt electrics, and gained an extra carburettor and wider fork yokes. A UK version was launched with flat bars and twin instruments. The Atlas continued to be built until 1968 but by then the Norton Commando had taken over.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Norton Atlas」の詳細全文を読む スポンサード リンク
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