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Harley-Davidson XA opposed-twin engine runs 100 °F (38 °C) cooler than a V-twin. [4]During WWII, the U.S. Army asked Harley-Davidson to design a specification of a motorcycle much like the BMWs used by German forces, with shaft drive, a boxer engine, and several other features that made the BMWs exceptionally reliable and low-maintenance machines.
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.
Model Engine Years Notes Model 125 125 cc (7.6 cu in) two-stroke single 1948–1952 Copy of DKW RT 125 given to Harley-Davidson as war reparations. More than ten thousand were sold in the first year of production. Model 165 165 cc (10.1 cu in) two-stroke single 1953–1959 Replacement for the Model 125, with larger engine. Hummer
Pages in category "Motorcycles powered by flat engines" ... Harley-Davidson Model W; Harley-Davidson XA; Honda Gold Wing; Honda Juno; Honda Valkyrie; I. IMZ-Ural;
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
Harley-Davidson largely copied the BMW engine and drive train and produced the shaft-driven 750 cc 1942 and '43 Harley-Davidson XA. This shared no dimensions, no parts or no design concepts (except side valves) with any prior Harley-Davidson engine.