I agree with everything that's been said about the engine, and also about chainsaw engines. The only caveat is, if you are considering a particular chainsaw candidate, look up a parts diagram for it FIRST. Many saws are made with the engine as part of a huge case that includes the oil tank, sometimes the fuel tank too, etc. These are difficult to convert and design a mounting for. I have a Stihl 62cc that was like that. It's a great engine, but MAN was it a bunch of work to convert!

AV8TOR