They usually have larger ports too, and often come with a suitable carb so you don't have to look for a larger one.

What I often do when I am considering an engine is look around on the internet for a "blow up", (diagram) of the engine. That way I can see how it's made as far as whether the crankcase is part of the saw or not, where does the carb mount and exhaust exit, etc., to see if it is a good candidate for airplane conversion without even having to disassemble it.

The "crankcase being part of the saw" isn't always a deal killer though. If it is otherwise a good engine to convert, those often make the lightest engine but they require a lot more work cutting the engine out and coming up with proper mountings....

AV8TOR