The outboard motor kill in "I Spit On Your Grave" was partially the dumb victim's fault. Not that he didn't have it coming to him.
I think that the funny thing about the outboard motor kill in this movie is that the killer is holding it. The motor is not attached to a boat in any way shape or form.
Ah, when I think of "outboard motor death" I just think of someone who dies because of an outboard motor, not necessarily whether it's been wielded by hand or on the back of a boat so much... hmmmm, I'm hard pressed to think of a movie other than this one that would involve that.