1987 18ft aluminum fisher CC with a 1999 125 Mercury. Just put this motor on the boat. I started off with a Powertech 19in RED prop. I had 37MPH at 5250 RPMS. I believe I'm hitting the rev limiter. My speed would climb when i trimmed up, but the boat would immediately begin porposing with very little trim.
I raised the motor up to the top hole thinking that that would help but I don't notice much change.
Appreciate your help.