I have a 6hp Evinrude ser# 6202D J08497, I believe it is a 1972 model. I have replaced the coils, plug wire, condensers, points and re built the carburetor with a kit. The engine starts up great and has plenty of RPM when not in gear, however when I put it under load it drops RPM's and does not provide much power. It will however jump in RPM,s if I raise the engine out of the water and allow the prop to catch air but when it goes back in the water RPM's drop. I also done a compression test on both cylinders and got 75 top, and 80 bottom.<br /> Can someone please give me a direction to run with I'm all ot of suggestions.