1972 Harley-Davidson XR750 Evel Knievel Is Not Quite the Real Thing, Comes Close 6 Apr 2021, 7:44 UTC · by In 2020, Harley-Davidson celebrated the 50th anniversary of the XR750 in style by wrapping the entire racing hardware it fielded, including the team haulers, uniforms, and branded accessories, in the iconic Jet Fire Orange, the competition color used by the Harley-Davidson Factory Flat Track team. But other hues are perhaps equally iconic for the model. 25 photos The XR750 was introduced as a replacement for the KR750 in 1970, and quickly became the dominant force in the AMA Grand National Championships. In fact, the model is to date the most successful in the competition’s history, having won 28 championships between 1972 and 2008.