I wouldn't recommend it either. I run a 5hp Briggs and Stratton on mine and do well to keep it balanced. The long shaft of the mud motor would make the balance problem even worse and tight turns would be impossible. The 5hp Briggs and Statton with an extension is a better bet. Also, if you run shallow water and a lot of weeds, get the short shaft and sharpen your prop blades with a file. Experience is the best teacher... Pat