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The Benelli Sei is a series of motorcycles that were produced by Italian manufacturer Benelli, and masterminded by automotive designer Alejandro de Tomaso, from 1973 to 1989.〔Benelli 750/900 Performance Portfolio 1973-1989. R. M. Clarke. Brooklands Books, 20 Jan 2005〕 Two models were made, with 750 and 900 cc displacement. The 750 was the first production motorcycle with a six-cylinder engine. ==Benelli 750 Sei== The Benelli 750 Sei was the first production motorcycle with a 6-cylinder engine and had two model releases.〔Imports and Motorsports. Bill Hartford. Popular Mechanics Jan 1974〕 De Tomaso intended it to become Italy's premier sporting motorcycle and wanted it badged as a Moto Guzzi. On its launch, it received tremendous publicity overshadowing all other Italian bikes of that year. It started the trend of angular designed motorcycles moving away from traditional round forms.〔The Moto Guzzi Sport & Le Mans Bible. Ian Falloon. Veloce Publishing Ltd, 30 Jun 2007〕 The engine was based on the four-cylinder Honda CB500, but with two extra cylinders.〔 The cylinder head fins of the Sei were squared off to provide a cosmetic individuality, but otherwise the engine is in most respects obviously derived from the Honda. The "angular, bold design" was by Carrozzeria Ghia. It produced at 9,000 rpm, had a top speed of around and was one of the smoothest European tourers.〔〔World's Fastest Motorcycles. John Cutts, Michael Scott. Book Sales, 1 Aug 1991〕 Despite the extra cylinders, the Sei's width was kept to a minimum by siting the alternator (which, on the Honda, is at the left-hand end of the crankshaft) behind the cylinders. Cooling was improved by having air passages between the cylinders; the Sei had three Dell'Orto VHB 24 mm carburetors (the Honda CB 500 had four, for four cylinders).〔 The vehicle appeared to reviewers as heavy and cumbersome but handled surprising well, and had a unique signature exhaust note from its six mufflers.〔365 Motorcycles You Must Ride. Dain Gingerelli, Charles Everitt, James Manning Michels. MBI Publishing Company, 10 Jan 2011〕 The Benelli 750 Six remained the only six-cylinder motorcycle in production until the entrance of the Honda CBX in 1978. 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「Benelli Sei」の詳細全文を読む スポンサード リンク
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