[quote=Delphinus;815492]On the 6065 there should be a little bump like thing on the inside of the cover that when the propeller spins backwards, it would hit that and then start spinning in the correct direction. (If a propeller spins backwards it will want to pull up and thus hit this bump, otherwise if spinning in the correct direction it will miss it.) Either the bump has worn off the cover (and thus the cover needs to be replaced)

This is exactly what happened. I replaced a housing, and it's works like a new.
Thanks again.