1971 Harley Davidson XR-750
To maintain its competitive edge after an AMA (American Motorcyclist Association) rule change, Harley-Davidson developed the XR-750, which had an efficient overhead valve engine that enabled it to better compete against machines built by rival firms having similar engines. Introduced in 1970, the Sportster-derived XR-750 was at first uncompetitive because of an engineering design flaw that led to overheating. By 1972, the problem had been corrected and the XR-750 went on to become one of the most successful motorcycles in AMA history.
Moto Talbott Collection