muffler repacking

im repacking the muffler on my 2007 rmz250 and wraped around the core there is what looks like some packing with steel mesh around it. what is this? and should i replace it along with the packing? thanks

thats how a lot of 4 strokes are, if it looks worn then replace it as well-if not leave it in place.

i soked it in my solvent tank and then rinsed it off and all it is is just layers of mesh. it cleaned up really good and didnt look worn or damaged in anyway so i just put it back in. But do you know what it is and what its purpose is?

it helps stop the normal packing from burning out.

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