Rotax exhaust white grayish soot?

Thanks! I begin my condition inspection after end of May and this will be on my list of to-do's.

Roger Lee wrote:

Copper colored. Greyish is usually exhaust. I see the grey all the time around the exhaust knuckles where they meet the muffler from leaks. If it was a big leak then that can be blown out to the bottom of the plane. I'd start by looking at my exhaust / muffler knuckles for leaks since it's a common occurrence. 

Roger, how do you recommend fixing an exhaust leak at the ball joints? My A&P has tried by adding lots of anti-seize to the ball joints. Has never worked and I keep getting lots of white around some of the ball joints and all over the exhaust springs. 

Sometimes you have to loosen the nuts where the pipes come out for the head and try to realign the muffler some. There are times that this can't be done due to engine mounts and others things that are in the way. If this happens and I can't move the muffler and anti-seize and or increasing the spring tension won't fix it then I just use some header wrap under the springs and then apply a wormdrive clamp. This keeps it from spraying exhaust all over and possible damaging hoses or wiring.  Plus it keeps the engine clean.