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The 1984 Harley-Davidson XR-1000 Sportster motorcycle was powerful buy too pricey. See pictures and learn about the Harley-Davidson XR-1000 Sportster.
The 1931 Harley-Davidson Model D switched from F-head to flathead (side valve) V-twins. First was a new 45ci model to compete with the Indian Scout. The next year the 61ci and 74ci Big Twins were changed to a flathead design. Read about the Model D.