RCSM
Your 91 would be a good choice for the Excite 90 The wing Root is about 2 1/2 to 2 3/4
This lets this plane fly reel slow I feel it will Hover great I'm not as good on that maneuver as allot of flyers but I can do all the other cool stuff. One of the guys have a Funtana with a 91 four stroke and I think it's too much. One of the cool things about the Excite is you can get in trouble and as long as you can get the wings level it will just about stop in midair and give it a little throttle off it goes. It take vary little rudder for knife edge and would be better with coupling. The last couple of time I have flown the Excite it has been vary windy and you can point it in the wind and pull back on the throttle and it will fly backwards.
I just love this plane