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The FN Four, manufactured in Liége, Belgium〔''Motor Age'' 1916, p. 27〕 by Fabrique Nationale from 1905 until 1923, was the world's first production inline-4 motorcycle.〔Edwards 1997, p. 43〕〔Petersen Automotive Museum: "The 1904/05 FN was the world's first mass produced four-cylinder motorcycle."〕 It was also, at , the world's fastest production motorcycle from 1911 until 1912.〔Brown 2006, pp. 12–13〕〔Krens 2001〕 The motorcycle was developed in 1904, tested late that year, and had its public debut at the 1905 Paris Motorcycle Show.〔 It was a commercial success upon release, with production increasing over its twenty-year run.〔C. F. Caunter 1955, p. 21〕〔Hough and Setright 1996, p. 38〕 ==Technical details== The motorcycle was originally single-speed. In 1909, a two-speed transmission was offered,〔Offered in 1909 in the United States, see ''Cycle and Automobile Trade Journal'' 1909, p. 188〕 then three-speed in 1914 with the 748 cc engine.〔 It had a single speed shaft drive turned by a bevel gear.〔 The rider started the engine by pedaling bicycle style pedals with a chain drive and sprockets to the rear wheels.〔 The 1905 model had a high-tension Bosch magneto ignition,〔 a spray carburetor, and a rear coaster brake operated by the pedals.〔 It had a 5:1 reduction ratio to 26" wheels.〔 By 1908, it had a two speed transmission with a plate clutch, overcoming the speed limitations of the earlier model.〔 In 1909 a rear drum brake was fitted.〔 In 1910 engine was redesigned and enlarged to , the carburetor was moved and a new oiling system was used.〔 The weight in 1910 was .〔 For the US market, the 1908 model was upgraded and released as a 1908 model, called the F.N. Big Four.〔''The Horseless Age''. 1908.〕 Engine power was raised from to , the frame size was reduced from allowing the rider to sit with both feet on the ground, the wheel rims were made heavier and would fit American tire sizes, and it came with tires with a heavier tread.〔 The 1911 model weighed and had a wheelbase of .〔''Motorcycle Illustrated'' January 12, 1911〕 The US model had either Goodrich or another imported brand of tires, and a leather seat made by the Mesinger Bicycle Saddle Company of New York.〔 By 1911 bore × stroke was up to and nominal output was up to .〔 The motorcycle had bicycle-style pedals used for starting until 1913 when a kickstarter was adopted.〔Duckworth 2012, p. 26〕 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「FN Four」の詳細全文を読む スポンサード リンク
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