Hi,
I bought a 1985 15 Hp Evinrude used and it came with a 9.5" x 10" prop.
I am using the motor on a 12' Livingston with a total weight of about 800# with kids, fishing gear, beer, etc.
The motor doesn't seem to "rev" up like it should.
Using a portable tach the engine will only rev to 4500...