Hooked,
I know that the instructions say that it's not rated for over a 61, but I used it anyway. I've got a OS 91 Surpass II mounted on it and haven't had any problems with it at all. In fact, I've used the same mount in the 2 Hogs I had before this one. I've you're going to use a 91 4-stroke I'd go ahead and use it.