on the homelites, take the muffler off, the 30cc will not have a bridge in the exhaust port, the 25cc will, actually, if you look at just the right angle through the spark plug hole you can see the exhaust port too...

there's a guy I fly with sometimes with this plane with a G26, seems to have decent power, I was kinda thinking one of the ~30cc engines myself for the plane since that would be closer in par with the G26 than a 25. the 46 was a wild thought, I still have to get the carb adapted to the engine and it's pretty much ready to go.

Thanks for the input!