I have that plane with a Zenoah G23 on it. The plane builds as we used to say "like a brick outhouse". It builds really heavy. I have a couple of Ryobi 31cc two cycles that I converted but haven't mounted yet. One is on CH ignition, the other uses the flywheel. I plan on putting one of them on a Dynaflite PT19 that I hear they fly really well. The Ryobi is too big and heavy for the Cub. But I doubt that it would fly on anything less than the G23.