I bought a 370 outrunner used for a plane and when i crashed it later the motor makes these weired noises. I thought it was the shaft so i replaced it but that wasnt it. Now i am fusterated. It sounds like almost a grinding noise. BTW the prop is a 11x4.7 is that to big for it? I am also using a 3 cell lipo and an e light 20amp speedo.