i have a 1998 yamaha 90 hp 3 carb setup. i just bought the boat and it would only get to 4500rpm. i was told that it shuld get close to 5500rpm. i changed from a 19pitch to 17 pitch prop. now it will get 5000rpm and run 36 miles per hour . this is on a 17.2 foot keywest at aprox 1150 pounds i...
