I have the 60 size Stik with a SuperTigre 90 engine. The problem I’m having is after I take off and get airborne I give it full throttle it flutters and kills. I make sure that its trim out and the mixture is ok before takeoff. Also this engine only has about 4 flights on it. My first flight was perfect. The last three has been again fluttering and then it kills after takeoff. I am now contemplating on getting another engine for this plane. What engine would be good for the Stik without all the headaches? I really like the Stik and want to enjoy my flying.