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I ran a 23cc Bumble Bike 2 cycle engine years ago on a Huffy 3spd bike with a Yamaha Virago windscreen. Cruised at 25 mph with a 1 in dia. knurled shaft turning against the 26 in tire. Too bad it is banned now in NYS. Still have all the parts and papers. If my daughter goes to college in PA I may mount it on her bike. I'd guess 150 to 200 mpg possible.
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