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The Harley-Davidson Sportster is a line of motorcycles produced continuously since 1957 by Harley-Davidson. Sportster models are designated in Harley-Davidson's product code by beginning with "XL". In 1952, the predecessors to the Sportster, the Model K Sport and Sport Solo motorcycles, were introduced.
The unit construction of the Harley-Davidson Sportster, which has essentially been unchanged since its inception as the side-valve 750cc "K" Model in 1952, was retained with the Evolution engine upgrade in 1986, resulting in a unique valve train configuration.
A variant of the Revolution Max called the 1250T [3] saw use in the Sportster S, the first motorcycle under the Sportster nameplate to receive a new engine since 1986. [ 4 ] A 975cc version of the engine was announced for an upcoming streetfighter motorcycle called the Bronx , but that bike has been put on hold and may be cancelled. [ 5 ]
Harley-Davidson Twin Cam engine at the Harley-Davidson Museum. The Harley-Davidson Twin Cam are motorcycle engines made by Harley-Davidson from 1998 to 2017. Although these engines differed significantly from the Evolution engine, which in turn was derived from the series of single camshaft, overhead valve motors that were first released in 1936, they share a number of characteristics with ...
In 1995, the engines were upgraded with Buell engineered high-performance parts and further upgraded in 1998. The liquid-cooled Harley V-Rod motor, developed by Harley-Davidson then made street legal according to the EPA by Porsche, [citation needed] was originally an Erik Buell project, designed for a fully faired AMA Superbike Buell by 1998. [11]
Street model using XR racing cylinder head and other XR engine parts. XL, Evolution, "EVO" 53.9 cu in (883 cc), 1,100 cc (6.1 cu in) (1986–1987), 73 cu in (1,200 cc) (1988–) 1986–2022 The first year of the new Sportster to have the Evolution overhead-valve engine, alloy heads XL883N, Iron: 53.9 cu in (883 cc) 2009–2022