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holy moley
I believe I have solved the mystery. I started taking the exhaust apart beginning at the block. All seemed well with no scale or soot buildup, although the old exhaust hose definitely needs replacing. I looked into it and couldn't find any signs of collapse or obstruction. When I got to a check valve in the system I found an old corroded check valve with the flap pin completely disintegrated and the flap rattling around inside. I opened it up and removed the flapper, essentially making myself a coupling. ABRA KADABRA....engine is running fine against the dock lines for the last ten minutes at about 1/4 throttle. Could that restriction be causing back pressure and causing the sooty plugs??? Going for a test run in a few hours when it cools down.
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