Motor won't turn prop in reverse. When I select Forward I can't turn the prop manually either way, when I select Neutral I can turn the prop either way, when I select Reverse then at first I can't turn the prop one direction but I can turn the prop in the other direction then I can turn the prop in both directions and there is a clicking sound. I think I must have selected Reverse while the motor was running too fast and stripped gears or reverse clutch or whatever. Is there no safety to prevent changing gears. Is it worth having fixed?