My 1998 Jag has 265 hp rating…contact the factory and they can make a new plate in some cases. My Jag really likes a 4 blade prop…Trophy, Powertek TRO4, Renegade, and Shooter all work well for me…I use 25 pitch…but im running a Johnson 225HO…so I cant speak to what your Merc may need. Good luck and you will love the boat. Ben
