OK , since someone opened the door to 4 strokes, I can tell you my World Mentor is powered by a 6 year old Saito 50. This plane is terriffic and will not disapoint you. I call It the "Goverment Mule" because thats how hard I have worked it over the past 3 years. I can fly it in mild 5-10 mph winds eaisly and most anywhere theres enough landing area. So, IF you can get your hands on a nice little Saito you will love the power and sound.

Just wanted to mention as an alternate option to 2 strokes.

Have fun with your new plane!!!

Bill