I have had two of these planes one with a GMS 76 2 stroke on it and it was plenty of engine. It had unlimited vertical with this engine on a 14x7 prop. It would knife edge good and would do any aerobatics that you would want. The other one had a Thunder Tiger 91 4 stroke on it and it was the best to fly. This was my favorite plane for 2 years and I loved flying it. The 4 stroke engine is the way to go on this plane you would love flying it. If you are going to use a 2 stroke I would get a 91 as they weigh the same a most 60 size engines. I have several super tigre engines and like them alot. You will not have problems balancing your plane with any of the engines that you choose.

Rick