I would not put a BB 46 on a stick 40. The plane flys on the wing so good it just doesn't need much power. My instructors club used Sticks for their club trainers for years and he had one with an old Super Tiger 29 on it. He said my 46 LA had more than enough power for it. I have put eight gal of fuel through mine and never deadsticked it. Lots of people don't like LA's because of the lower power output but they are good at what they were made for ,cheap easy to use powerplants for trainers. Lots of people say the GP series from Thunder Tiger are good engines. They are also a plain bushing engine.