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At the time it was built the requirement was that a motorcycle produce a minimum of 15hp, which was accomplished by using a bore and stroke kit that brought the engine to 130cc. I plan to usea 250cc engine, with EFI and some other mods for fuel economy, and a more upright seating position to improve visibilty (plus at 55 I can't see climbing in and out of the original's driving position!)
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