The engine model is 50273-C, serial E0011616. The engine seems to run fine but the prop doesn't spin. Forward/Neutral/Reverse are selected via push buttons on the throttle console. The console says 'selectric' on it...must be solenoid control of some sort. I don't think the gears are stripped 'cause I don't hear any bad noises when I try to engage...nothing happens at all. Suggestions, anyone?