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  2. Flathead motorcycles - Wikipedia

    en.wikipedia.org/wiki/Flathead_motorcycles

    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 ...

  3. Harley-Davidson XR-750 - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_XR-750

    An XR-750, number 16, through the dust at Scioto Downs, Ohio. The Harley-Davidson XR-750 is a racing motorcycle made by Harley-Davidson since 1970, primarily for dirt track racing, but also for road racing in the XRTT variant. The XR-750 was designed in response to a 1969 change in AMA Grand National Championship rules that leveled the playing ...

  4. Harley-Davidson Panhead engine - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Panhead_engine

    The Panhead is an overhead-valve Harley-Davidson motorcycle engine, so nicknamed because the rocker covers resembled cooking pans. The engine is a two- cylinder, two- valve -per-cylinder, pushrod V-twin, made in both 61 c.i. (EL) and 74 c.i. (FL, FLH) displacements. The Panhead engine replaced the Knucklehead engine in 1948 and was manufactured ...

  5. Harley-Davidson RL 45 - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_RL_45

    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.

  6. List of Harley-Davidson motorcycles - Wikipedia

    en.wikipedia.org/wiki/List_of_Harley-Davidson...

    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.

  7. Harley-Davidson Servi-Car - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Servi-Car

    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 ...