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RevoPower: Moped Retrofit

Hey, let's don't actually expend any energy riding bikes—we could just replace our front wheels with a RevoPower and never have to pedal our bicycles again. Well, not quite. This little 1.1HP, 23cc, two-stroke internal combustion engine-that-could revs up to 7500RPM and its maker says it can reach speeds of 20 mph…