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Old 10-25-2010, 03:05 PM
GreyhoundOfYerfDogs GreyhoundOfYerfDogs is offline
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I did this as a teen with a strange off-brand engine I had found in an alley (small 4 stroke.) Rather than use the bicycle gears I used a rubber wheel about 4" diameter bearing against the rear tire. Using scrounged parts only, the gearing wasn't good at all, but it would propel my bike along faster than I could pedal. Running through even a little water made the wheel slip. If I did it again, a better drive wheel would probably solve these issues; rock-hard solid rubber with grooves is NOT the hot tip. Using the bicycle gears isn't that great of a plan unless you can get some mad reduction gearing.
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Stock Yerf-dog 3203, Project Yerf-dog 3209 13hp; Quads: Honda 250, 400, Kawasaki KFX700
First kart built 1981, 2.5 horse Briggs and frame made of 2X4s