I have one of these birds. I have a OS 91 four stroke and I feel it's a perfect match. Take off's are at 1/2 throttle and fly between 1/2 and 3/4. People love to shove a 120's in a 91 plane. This plane is so light, in my oppinion, the 120 is too much for this plane. You will love it with a 91. In whatever you decide, you will enjoy this plane. Good luck.