Weird stuff Encan!!! A Cox reed valve engine should have little problems with that plane. I doubt you hurt the engine during break in so don't worry about that. The new Babe Bee's are real good out of the box. How old is this engine you have? You could try cutting down the prop to 5 or 5.5 inches to get the rpm up. Are you handy with power tools? If so you can open up the hole in the tank tube. This will help alot on power but your run time will go down hill with only a 5cc tank. I'm sure a Black Widow would do the job better as it has the 8cc tank, larger venturi and better cylinder so you would look at a 3,000rpm increase. Do you have any other Cox engine or parts now?


Later,
Tim