I would like to put a 4 stroke on my Sig se, I have a magnum 61, it doesn't seem to have enough power, and I started out with an os 46fx it was ok, but I wasn't impressed with it as well. Any suggestions?

thanks to all of the replys, but I now have a couple of new questions

1. saito 72; what prop size, did you have to make any modifications to the plane ?
did you have to add tail weight ?