well as i am in the market for a new outboard for my strikeliner. i wanted a 30hp, so i asked orkney who said they get asked this all the time, but as long as i do not put too much weight on the transom or exceed the max speed 22knts should be ok .so i have asked my insurance company if fitting a mariner 30hp EFI fourstroke would be ok . they are checking for me . the 25hp EFI is the same engine but revs lower with different electronics. when i get a answer will post what they say .