I have a Chrysler 135 with a 13X21 prop on a<br />1974 Beecraft 16' tri-hull. the problem I'm <br />having is the engine won't make operating rpm<br />of 4500-5500 rpm, I get 3800 rpm @ 30 mph <br />with 2 people in the boat, and with more than <br />2 poeple the boat won't even get on plane.<br...
