In 1970, all the XL models were fitted with the same engine cases. Between 19, two cases were made for the Sportster: one for the electric start bikes and the other for the kick-start models. The new model came with revised engine cases to incorporate electric start. 1967 Harley Sportster XLHīefore the 1967 XLH, all the previous models were kick-start only. Integrated within the back of the engine cases was a “unit” 4-speed transmission while the motor, which was almost hidden perfectly behind the gas tank, featured twin cylinder jugs separated by about 45 degrees. Individual valves were controlled by a separate cam to simplify the valve train geometry, while both the front and back cylinders were fed by a single carburetor.
One crank pin was used for both connecting rods, and was called a “knife & fork” design. The Sportster legend began with the 1957 Harley XL Ironhead, featuring a new overhead valve motor that worked with a 3.81-inch stroke and a 3-inch bore to produce 883cc displacement.
Here are our picks for the top 10 Harley Davidson Sportster models ever (in no particular order). The lineup was received by the US motorcycle market affectionately. The design was conspicuously reminiscent of the dominating British motorcycles of the 1950’s, particularly the Triumph Thunderbird. The Sportster was one of the first Harley Davidson models to include a rear suspension and a high performance, overhead valve engine. The introduction of the Harley Davidson Sportster into the American market in 1957 was more of a strategy to counter the increasingly successful British motorcycles being sold in the U.S.
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