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Worst problem is likely the 2 stroker itself. Those old carb'd ones usually aren't that efficient- lotsa raw gas out the exhaust, rich mixtures, etc. Then there is gearing.
I have a nice strong Stihl chainsaw engine I'd long wanted to put on a bike but never got around to it, partly due to laziness and partly due to realizing what I really wanted was a little 4 stroker like a Honda 50 or something.
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