I just got a good deal on a Yamaha 9.9 4 stroke stroke outbord. When I replaced the 2 stroke Evenrude I found it almost impossible to raise or tilt. In addition I felt it was necessary to stiffen up the transom with several pieces of 3/4" plywood to eliminate flexing. My questions are:Has anyone put a 4 stroke 9.9 on a 24.5?and What type of bracket do you suggest ?