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Just take the motor from a subaru 360 2cycle 2 cylinder, despite itself it is still more efficient than most 4cycle motorcycle rigs as it was tuned for FE, it puts out an amazing 25hp and may be large enough to run alone in an aerocivic if you could figure out how to get 6+ gears coupled efficiently to it of coarse in my line of thought if it only takes 15hp to go 90mph then bear the acceleration, enjoy the weight savings and just use a smaller motor by itself, even better would be a little diesel.
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