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The Servi-Car used variations of Harley-Davidson's 45 cubic inch flathead. From 1932 to 36, the Servi-Car used the engine from the solo R model. [1] It was changed in 1937 to the engine used in the W model, which differed mainly in having a recirculating oil system instead of the constant-loss system of the R. [2] [7] The "W" flathead engine continued until the end of production in 1973 ...
Models 5 and 5A had 28-inch (710 mm) wheels, the former with battery ignition and the latter with magneto ignition. 5B and 5C models offered the same choice of ignitions, with 26-inch (660 mm) wheels for shorter riders. Model 6 series added an idler arm. Model 7D: 49 cu in (800 cc) 45° IOE V-twin: 1911 Models X8D, X8E
The flathead engine saw service in Harley-Davidson motorcycles beginning with the Model WS flat-twin, produced from 1919 to 1923, [6] and continuing in 1924 with single-cylinder export-model 21-cubic-inch (340 cc) and 30.5-cubic-inch (500 cc) singles and continued in Servi-Cars until 1973. In the domestic U.S. market, the 45-cubic-inch (740 cc ...
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.
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For 2017, Harley released the Street Rod based on the 750 Street model. This new model introduced new features such as higher output Revolution X engine 68.4 hp (51.0 kW) @ 8,750 rpm and 47.2 lb⋅ft (64.0 N⋅m) @ 4,000 rpm, 43 mm inverted front forks and piggyback reservoir rear shocks, drag-style bars and 17 inch wheels. [8]
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The Steffey motorcycle in 1902, essentially a bicycle with a two-stroke engine attached, used wooden, rims with wire spokes. [1] This style of wheel evolved into a stouter motorcycle-specific wheel, still with spokes, up to the 1960s and beyond. [2]: 134 In April, 1922, Borrani started production of motorcycle wheels with an aluminium rim. [3]