I have a OS .91 FX in mine and it performs great. I have no experience with the engine you're contemplating, but the FX takes it vertical until I can no longer see it. Hovers at about 1/2 to 2/3 throttle. Two issues I did have: 1) Knocking (pre-ignition) - I added an extra head gasket which reduced this, but I still hear it usually in a nose down attitude. 2) Early to mid run flame outs for about 4-5 flights, but I attribute that to my inexperience tuning the engine. I think I went a little too lean too soon. Now it runs like a top. The great thing about the plane though, was that even dead stick with close to a full tank of gas the plane still landed real easy. Good luck with whatever you choose. I think you will like the plane.