I just purchased a 1988 Blazer Drifter X-17 (17') boat with a 1982 90hp Evinrude. The plate on the motor says (operating range 4500 to 5500 rpm). Using the power tilt and trim I can get the boat to plane out nicely but no matter what I try I can't get over 3000 rpm. The prop that is on it is a...
