I have a 2004 bass tracker pro guide 16 footer deep v. It has a 2004 mercury 60 hp 4 stroke on it with about 47 hours on motor. This is the first 4 stroke motor I have owned. Only had it for 4 months and taken it out 5 times. Previously I have had an 18 foot deep v with a 120 hp 2 stroke and a 16 ft mod v with a 35 hp 2 stroke. Normally when we go out there are 2 of us, maybe 2 and my teenage son, and the boat will do 30-32 mph at 5500 rpm all the time. Well today we went out in it with 4 adults and a good amount of gear with us. I know we were reaching max weight, and the boat would only do about 10 mph at 4100 rpm. I thought at first something was wrong so I dropped everyone off at dock and went for test drive and it ran like normal with no weight. I don't understand why it doesn't build up more rpm with additional weight. With my 2 strokes in the past it would be slower with more weight, but still build up and go, but 4 stroke doesn't. Why is this and is there something I can do to make it go quicker with more weight in the boat. I'm not expecting 30 mph that weighted down, but at least 20. And why won't the rpm's get any higher to try and get it moving more. My old 16 footer would move faster with 2 adults and 3 kids, and it had half the horsepower. Sorry for long post, but don't want to leave anything out. Any help would be greatly appreciated.
