Hello this is my fist post here I have a question about my 1986 Johnson v4 looper 140 it currently has 95 psi on all 4 cylinders I have rebuilt the carbs 2 times and taken them off 2 times more to clean again I have no gas leaks or air leaks my reed valves are all seated but Everytime I take it to the water it runs great for about 10 mins wot then boggs down and only runs about 5mph back to dock and runs ruff after bogging down does anyone have any suggestions for what else to check for? Thanks