I had posted earlier asking for input on re-powering a 125 Merc. on a like new Ranger R71. Several good thoughts from the board and decided to go with the Pro SX 115 CT and all I can say is WOW!!
Having tested several props I choose a Fury 3 / 24 and am getting 56 MPH @ 5900 RPM WOT. This little boat jumps out of the hole, cruises very well and has plenty of speed for my use. Night and day compared to the old 125. Starts on first click of the key, no smoke, 10 mph faster, much quicker out of the hole and so much quieter, when it is idling I have to look at the water cooling stream to tell if it is running.
Thanks for the input, I'm very pleased I decided to re-power and selected the Pro SX.