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That first engine was a single cylinder model, based on the French developed De Dion-Bouton internal combustion engine. The company was soon fully committed to producing its own proprietary engine designs, and by 1909 the first Harley-Davidson V-Twin engine had been designed and made, setting a template for engine design that continues today.
The single cylinder engine had been a mainstay of the Harley-Davidson line since the early days of the company's founding in 1903, but it was not until 1909 that the V-twin design was added. It was Introduced in 1926, and it disappeared from the program in 1934 and was reintroduced in 1937 as Harley-Davidson V - Twin B. [1]
Unlike almost any other engine in production today, the Sportster Evolution uses one cam per engine overhead valve, resulting in four individual, single-lobe, gear-driven camshafts. The cam lobes are thus all located one behind another, and pushrods are arrayed in pairs (front and rear) parallel to the cylinder axis as a result.
A 1955 Model B "Hummer" at the Harley-Davidson Museum. The Hummer was added to Harley-Davidson's model line in 1955. It was a stripped-down basic model using a redesigned "B-model" engine with the old 125 cc capacity. It was named after Dean Hummer, a Harley dealer in Omaha, Nebraska who led national Harley two-stroke sales. [2]
The Topper had a 165 cc (10.1 cu in) single-cylinder two-stroke engine mounted horizontally between the floorboards. [8] The engine required a premixed gasoline/oil mixture. The starter was of the rope-recoil type similar to lawn mowers [ 1 ] [ 8 ] [ 9 ] or the Lambretta E model. [ 10 ]
William S. Harley and Arthur Davidson developed the first prototype of a Harley Davidson motorcycle in 1903. The engine was designed according to the system De Dion-Bouton, had a displacement of 167 cc and made about 2 ps (1.5 kW). Since Harley and Davidson were dissatisfied with the performance, in 1904, cubic capacity was increased to 405 cm ...
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The first Harley-Davidson motorcycles were powered by single-cylinder IOE engines with the inlet valve operated by engine vacuum, based on the DeDion-Bouton pattern. [135] Singles of this type continued to be made until 1913, when a pushrod and rocker system was used to operate the overhead inlet valve on the single, a similar system having ...