Repower...76 evinrude to 97yamaha 115's ???

[searaft]

I have a76 18 footer with a 76 115 evinrude. It's a little hard on fuel and doesn't like salmon trolling speeds unless the motor is tilted up about 15 degrees. I'm looking at a 97 yamaha 115 saltwater series. Has any one had any experience with this kind of repower in performance, fuel, and instalation problems??? ............