My 14yr old 1650hrs 2gm20f runs beautifully. Sounds pretty smooth. There's no black smoke but only slight white/greyish smoke. New exhaust and mixing elbows.
Question is on long passage I'm seeing greyish bubbles that breaks to soot on water. Very little but noticeable. Should I be concern apart from slight carbon black staining on transom?
Question is on long passage I'm seeing greyish bubbles that breaks to soot on water. Very little but noticeable. Should I be concern apart from slight carbon black staining on transom?