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Flathead motorcycles are a type of bike that was a standard for pre-war motorcycles, in particular US V-twins such as Harley-Davidson and Indian, some British singles, BMW flat twins and Russian copies thereof. [1] Flathead motorcycles have side-valves contained within the engine block, instead of in the cylinder head, as in an overhead valve ...
Charles Gustafson left Reading Standard in 1909 and joined Indian as Oscar Hedstrom's assistant. [5] [6] Gustafson had designed side valve "flathead" engines for Reading Standard, which had been the first motorcycle manufacturer in the United States to use a flathead engine in a production motorcycle. [5]
33.4 cu in (548 cc) flathead flat-twin: 1919–1923 First of two H-D flat-twin motorcycle designs put into production, first H-D flathead motorcycle. The fork was a trailing link design. D-series (45 solo) 45.1 cu in (739 cc) flathead: 1929–1932 First H-D 45 cubic inch motorcycle, first H-D flathead V-twin motorcycle.
The Harley-Davidson RL 45 is a model of the R-series range produced from 1932 to 1936, preceded by the DL range (1929–1931), which was Harley-Davidson's first 45 cubic-inch and first flathead V-twin motorcycle, and succeeded in 1937 by the WL. The R-series range included 45-solo, R, RL and RLD models.
W. S. Harley's patented compression release system. [4] Note the screw caps in the cylinder heads giving access to the valves. 1922 Harley-Davidson WJ Harley-Davidson's intention in introducing a new middleweight model was to increase the size of the motorcycle market by appealing to new riders with an entry-level product. [5]
The company's founders started making smaller flathead motorcycle engines individually by hand and fitted to bicycles in the 10 ft x 15 ft wooden barn in Milwaukee that was the Harley-Davidson workshop of the time, prior to that in 1901.
The engine, designated M 56 S 6 or 212, was a twin-cylinder boxer configuration - four stroke with a flathead design. [1] The BMW R12 with two carburetors used a battery and coil ignition, while R12s with a single carburetor used a magneto ignition, capable of working independently from the battery.
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