Harley-Davidson ES sidecar Knucklehead 1936 - fotografía de prensa de motocicleta

This photograph shows the 1936 sidecar, attached to the H-D ES (sidecar version) Knucklehead model. The V-twin engine featured two valves per cylinder which were operated by pushrods. It was the third type of V-Twin engine used by Harley-Davidson, replacing the Flathead engine in 1936 (which had replaced the F-head or IOE engine on big twins in 1930).

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