Another prop question: 20' MA advice?

[Bushwacker]

Sounds like you've done your homework on the motor and tach! Your motor will live much longer and burn less gas and oil if it's propped to turn optimum RPM at WOT. Just make sure you do any testing with the load you typically plan to carry. I thought my 14x20 4B prop was about right till one day I had 6 divers on the boat and could only turn about 4600 WOT!

My 15x15 4B will turn 5400-5500 pretty much regardless of load, and gets on plane MUCH quicker. These 2-strokes have all needle bearings and very short strokes, so high rev's won't hurt 'em. Better to over-rev a bit than to lug 'em down with too big a prop!