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I've had versions of both. My Songi is an "electric bicycle" although it came complete and is not a bicycle converted to electric. I LOVE THAT THING!!! ...and it is my #1 choice whenever the task/trip falls within it's capabilities. I can go for weeks if not months without even starting my car.
I have a "BikeBug" engine assist which bolts to the front fork and drives the front tire via rubber roller. It's easy to install, doesn't slow the bike down when off except for the minimal added weight, and is good on gas. I come across similar units used once in a while.
Haven't done any home-brew bike motors yet...
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