The Davis Motor Mine Cart. Found in an abandoned Gold Mine in Northern California in the late 1970s, the Davis Motor Mine Cart is a home-built creation using most of a 1926 Harley Davidson 21c.i. B-Model motorcycle. The machine also features a Ford Model-A transmission and electric start.
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A shame they molested the bike! Must have been quite a racket driving this through a mining tunnel.
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Cool build. 
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That is way cool. I wish I had been the one to find it!
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Love the electric fan blowing on the cylinder head !
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