What would have to be done to increase 1990 100 hp<br />Merc to 115 hp? Could it be as simple as changing jetting in carbs or more major?<br /><br /><br /> Bob Guess <br /> Fishing for Fun
You'd have to change all 4 carbs. It's not just jetting. It has more to do with the throat size of the carb. There are also other factors, but the cost of 4 carbs usually is plenty to discourage modification. You wouldn't notice much improvement anyhow. Maybe 2 or 3mph. Husndreds of dollars for 2-3mph? I have WAY better things to do with a few hundred bucks.
