Black goop in the water

[skibumtx]

Was winterizing my 06 21V today, needed to change the oil, so I changed out the plugs first then started the engine. Noticed black flecks, looked like carbon, coming out of the exhaust. Any idea what it is?

[foxriverat]

When was the last time you checked your impeller. If the black rubber was deteriorating it could look like that. How much was mixed in the water coming out exhaust?

[skibumtx]

I just changed the impeller this week, it looked like new. There was quite a bit of carbon floating on the exhaust water, but this may be from me cleaning the carb throat. It had a coating of black crud on it, so I put a rag in it and sprayed it off with carb cleaner. Some may have gotten in. I need to pull it out and start it again, see if the problem is still there.