What size prop for a Bass Tracker 175 with Merc 40

[rocknemo]

A good friend just picked up this boat for a great price but the aluminum prop is destroyed, what size stainless prop would work best for this boat, we know its underpowered with that 40 but he just wants to get it usable until he upgrades the motor.

[JHall]

If it's a 3 cylinder 40, I think a 13P Vengeance would work good on this boat. I would also recommend replacing the 40 hp reed stops with 50/60 hp reed retainers on the intake plate and installing 50 or 60 hp carburetors to wake that motor up as the 40 carbs and reed stops have that motor fairly restricted.