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The Sportster XL was introduced in 1957 with a 55ci (883cc) OHV engine. The engine was integrated with a four-speed transmission and included iron heads and cylinders, Linkert DC carburetor, and four cams. Essentially, the new XL motor was an updated K-model engine with larger displacement, overhead valves and higher compression. - Harley-Davidson Archives Copyright H-D View Related Article
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