Harley Davidson First Engine 1905 - 1908

This 25 ci. (405 cc) 3 HP Single cylinder engine is the one that drove Harley-Davidson first real production line starting from 1905, William S. Harley and Arthur Davidson start to develop gasoline engine in 1901 for there bicycles , later on with the collaboration of Ole Evinrude they developed more and bigger engines and produce the 1903 prototype bike which already show this engine form, the cylinder and head are one piece cast, and the in / out passes creates an F shape gas flow, its valves arrangement known as IOE (Intake over Exhaust ), few changes where made on later engines, oil vane added on the left side of case for routing oil from main bearing back to lower point and the two top most case nuts location is closer to the cylinder base, the intake manifold diameter is bigger and the right side cover orientation maybe different...

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