I replaced my factory prop on my '83 25 HP Mercury outboard. The new prop was a 15 pitch. The boat would fly with just one person in the boat. With two it would not plane out. My guess is that the 15 pitch prop is great for speed but lacks the torque to plane out with the additional weight. Can anyone tell me what the factory pitch was on an '83 25 HP Mercury outboard prop? Or does anyone have any other advice on this topic?
