If you have a 16 foot Bayfisher with a 90 hp Yamaha 2 stroke would you please tell me what prop you are running? How many mph you get from that prop and what the max rpm range is? What height you have motor at? Example from my setup below. I am running a four blade "make" SS prop 13 1/4 inch 15 pitch prop. Max rpm. 5500 Max MPH 38. Motor raised to the bottom hole on the yamaha motor mount.