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The BMW K100 is a family of four-cylinder 987 cc motorcycles that were manufactured by BMW from 1983 to 1992. ==Background== As the 1970s came to an end, BMW faced three problems from developing its flat-twin boxer engine further: *Emissions regulations being developed in the United States and the European Union meant that more control was needed over the amount of fuel entering the combustion chamber. From an engineering standpoint this was easier to achieve with more cylinders at an overall smaller displacement. *The market-led development of bikes was leading to the Japanese factories developing smoother and quicker machines based around a four-cylinder format. *Bike comparison in the media at the time was based around top speed, and a four-cylinder when fully developed created more power. In combination, this meant that BMW's marketing to users of a superior bike, allowing them to price at a premium, was being quickly lost, resulting in a loss of sales and market share. At the time, BMW, Moto Guzzi and Harley-Davidson were the only major "high end" manufacturers that did not offer liquid-cooled engines. Competing brands, notably of Japanese manufacture, were touting the superiority of their liquid-cooled engines and had introduced low maintenance shaft-drive technology in a growing number of their models. 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「BMW K100」の詳細全文を読む スポンサード リンク
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