I have a Evo Trainer engine, that is a big pain. We cannot get it to run right for anything. I have change fuel lines, glow plugs, and taken the fly wheel off. These have helped a little, but it just will not run right. I, and everybody I fly with, am not impressed at all with this engine. I just borrowed an OS 46 so for the time being just so that I can fly. I would not recommend this engine.