Ok, I guess I need to explain the above statement. I have a 2004 18.5 Crestliner Sportfish, with a 125 HP Saltwater Merc on it. The engine is one of the 2+2's, and the hull is aluminum. It seems to me, that with 125 hp's, top end should be higher than 34 mph.
The prop is original, a Merc...