I have a spirit with a 115hp yamaha. I bought it used. I assumd the motor was factory mounted. The real problem is that we salmon fish out of the boat and spend a lot of time in the back.There is continually an inch or so of water in the back. Is this normal for this boat or is the 115 at the limits of the weight for the transom? Has anyone else had this type of problem. I've considered building a small removeable deck, but I'm not sure how I would keep it in place. with the plugs in we are O.K. but any water we ship or if we want to clean off the blood. Things get a little soggy.