Re: Honda 75HP
I somewhat disagree based on your discription. There is no such thing as slightly in gear; it either is or it isn't. If it is, the boat would be doing circles. I am inclined to think you see the prop spinning slightly when in neutral and the engine running. Mine does this too, as does my motorcycle. It's just the oil in the gearcase spinning rapidly and this movement is transferred to the prop. Why one does it and not the other? Maybe thicker oil in one or a little water in the other, castle nut to tight or just the fit of the gears on the shaft.