I've got an 140HP evinrude VRO (year 1991 or 1992) and i use it for pulling wake and ski. The boat is a 5m dinghy. I've some difficulties to pull heavy skier and i would like to increase the capacity of my engine. <br />I'me looking for the best max RPm for this engine in order to chose the right propeller.<br />Thanks for your aanswers and any other advises. 
