Thor Model U

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Thor Model U was a motorcycle that debuted in the 1910s with a 7 hp V-twin in the Thor marque of Aurora Automatic Machinery Company of Illinois. [1] The 1913 model came with a 61 ci (cubic inch) V-twin engine, with the V at an angle of 50 degrees. [2] In 1914 the engine size was increased from 61ci to 76.25ci [2] The motorcycle had chain drive with clutch and was overall a bicycle configuration with two handle bars and seat above a frame which housed the engine and connected the front and back. [3] The V-twin has an angle of 50 degrees. [4] By 1916, the Model U was essentially the "flagship" of the Thor lineup with a large 50 degree V-twin with mechanical valves, a magneto ignition, and a three speed transmission. [5] These kind of features were improvements over typically features of the day like a single-cylinder engine, battery start, and two speed or even single speed;they were much closer to their bicycle origins they had just birthed from in the previous decade.

Thor (motorcycles)

Thor was an American manufacturer of motorcycles and motorcycle parts especially engines, founded in 1901 in Aurora, Illinois. From 1901 to about 1907 it made engines under license for Indian motorcycles of Connecticut, which Thor was also allowed to sell on the open market. Thor also sold a large variety of parts and when the agreement finally ended, entered the motorcycle market on its own selling complete bikes until about 1920. Some of its success were supplying engines to many motorcycle manufactures of the period, some record setting bikes in the early 1910s, and V-Twin engine with automatic valves.

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The motorcycle was fast for its day setting some records and also competing in the Dodge City 300 according to Bonhams. [2] The Model U was preceded by the Model O, which had a different engine design. [2]

Aurora Automatic Machinery Company was based out of Aurora, Illinois, USA that produced the Thor motorcycles in the early 1900s. [6] The Model U shared parts with Model W, which had single cylinder. [7]

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See also

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Harley-Davidson Model 7D

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The Harley-Davidson Model W, also known as the Sport Twin, is a motorcycle made by Harley-Davidson from 1919 to 1923. Unusually for a Harley-Davidson motorcycle, the Model W had a flat-twin engine and a trailing link fork. The Model W set speed records on runs from New York City to Chicago and from the Canada–United States border to the Mexico–United States border. Slow home market sales led to the end of production after four years.