I need help, I have a Honda BF 2.3 motor on my Hobie Tandom Island sailboat, currently I have a Honda bf 2.3 motor on the boat. The boat currently top out at around 20mph, and I have blown one engine already over revving (the stock prop on the BF 2.3 is 7 1/2 dia 4.5 pitch). I currently have a...