My Father In-Law has a 16 foot Pro Bass Fish-N-Ski. He had a 1990 90 HP 2 stroke Mercury and is in need of a new motor. He is wanting to buy a new Merc 90 HP 4 stroke, but when we went to the dealer today and talked with him about it the dealer said that the 4 stroke 90 HP is to heavy and he could only put a 60 HP on his boat. I know that a 4 stroke is heavier, but are they THAT much heavier?? My Father Inlaws boat is rated for up to a 115 HP motor. To me the 90 HP 4 stroke would be fine. I encourage all opinions on this.<br /><br />Thanks.