Sounds like I am the oddball here. I put an OS .91 4-stroke on mine. I balances perfect but mine is a bit of an oddball. I converted it to a taildragger straight out of the box and use it for all kinds of fun flying. It has floats and skis as well as wheels. Great airplane for lazy day flying, sitting in a lawn chair and flying it up outta sight (almost) then riding thermals untill you get tired of it is a blast. I thik a Saito .72 would be perfect but you might have to add some nose weight.