My TD14A was running beautifully. Clean & smooth. I worked it a bit harder one weekend and the next week it was smokey on startup and missing. I bled the fuel system and she ran smoothly and clean again. However, the next start, she was smokey again and missing a bit.
Then I broke a track and had to deal with that. With that problem fixed, it's back to the smoke...
There seems to be some fuel in the water and it blows very very small bubbles in the water. The radiator leaks a bit