After a little searching today,I have a flex exhaust pipe failure and it basically stopped up the air filter on the generator and of course the generator ran rich and that caused the black smoke.I need to replace the flex pipe,back in about 2006 there was an article about replacing the flex pipe and the pipe insulation written by a yacht repair guy that had a problem on his Liberty,i think that he even gave the information of the vendors that he used,does anyone know where this article is,or the flex that he used?