YAMAHA MOTORCYCLE MODIFICATION: Harley Davidson Sportster

The Sportster is a line of motorcycles produced continuously since 1957 by the Harley-Davidson Motor Company. 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. These models K, KK, KH, and KHK of 1952 to 1956 are not always considered to be true Sportsters,[by whom?] but are the precursors and inspiration for the line, the main difference being the engine. The K models had a flat head engine, whereas the XL models use an overhead valve engine.