Got a new boat (2001 Chapparal Sunesta 252) with the 7.4L MPI Mercruiser that I am finally getting summerized. Came from Texas at 1000' elevation to Wyoming at 6000' elevation. After a lake test dealer says it is putting out 3800 rpm @46 mph & that "I need to re-prop it to get the rpm's up to plane faster & get it to where it needs to be". Very rarely will I even have it at WOT. Just plan on doing some tubing with the kids, fishing & cruising (at speeds below the 3800 rpm). Is it necessary to re-prop? With the low rpm's now, will it eventually ruin the engine if I don't re-prop by running at lower rpm at WOT (rarely will). Sorry for all the questions & my lack of knowledge on the subject. I just don't want to potentially ruin the engine & need a little guidance & understanding. I tried to do some searching & couldn't get anything to pull up when I searched for WOT, RPM, 7.4L
