I have a 2004 pt 185 tracker aluminum boat. It has a 90 hp Mercury on it. I changed from the stock 12.75 x 21 aluminum prop to a 13 x 21 michigan match prop. The rpm's went from 5500 to 5600 at wot. I don't have a gps but the speed seems a little faster. It is running about 43 to 44 mph. It has...
