What size prop should I try?
I finally got a tach working on the boat today.
The pontoon is a 16 footer.
The motor is a 1989, 40 hp mercury.
The current prop is alum. with a 13 pitch. here are the numbers stamped on the prop. 48 73136 A40L 13P
The wot rpm is 4100.
The speed checked with...
