I have to laugh we have 3 or 4 of these DA's in our club and they all ran fine right out of the box. After break in I leaned mine out just a touch. If you lean it out to much it will stall when you punch it especially when cold I idle mine down to where she wont roll out on the field when at idle if you idle any engine down to low and do an inverted flat spin or any other manuver that torques the prop around your asking for trouble. I found My DA to be worth every cent i spent on it. I am however very curious to find out what the turn around time is on an Evo sent back to horizon so far DA has averaged about week.