Here is my very favorite: The 1911 board track racer.
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I've dreamed of building a version of this bike, and even went so far as to design one around an old Honda XL 350.
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I still hope to be able to build that bike someday, even though someone already beat me to it and built one around a Yamaha XT 500 engine. You can see his entire build here: http://www.advrider.com/forums/showthread.php?t=619303 There is some incredible craftsmanship there. It turned out GREAT too:
Oh, right, so the one I built.
Lets see what we can do with all of my wifes jewelry stuff.
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Frame was bent out of little bits of wire that are supposed to be made into earings. The rims were pre-rolled just like they are there.
See that lump of aluminum?
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Thats the gas tank.
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Forks done. Look familiar?
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Engine was made from the bottom of a 1/4" bolt and the tops cut from two spark plugs.
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Test fitting.
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Painting was a real pain in the hiney.
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Starting to come together. Used this fancy wire from Walmart to add some detail.
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Took me 4 tries to get the pedals right, 3 tries to get the mag and plug wires right, and lots of tries for various other bits...
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Made some custom decals with water transfer paper. Took several tries on regular paper to get the size and curve right but I think they turned out okay.
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Voila! Done.
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And to get a better idea of the size:
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"Final" pic.
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Now if only I could afford the REAL one!