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exhaust packing

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im looking to quiet down my 02 yz250f, it has a fmf powercore iv. can u put exhaust packing in this exhaust system? :thumbsup: thanks in advance.

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Most if not all exuasts systems have some sort of packing. Yours certainly does. The packing will obsorb sound waves keeping the bike quiet. Overtime, the packing gets cloged with carbon from the exaust gases, so you need to replace it. Just remove the end of your muffler and slide the inner pipe "has holes in it" out. Remove the old packing. It should look like fiberglass house insulation. Replace it with new packing. Some of the 4 strokes have a steel wool looking mesh between the pipe and the insulation. You should replace that also. If your packing is very old, the new stuff should quiet your bike down some, but don't expect that much. If you need more suppression, you can get end caps that also reduce the noise. Just do a search (if it is working).

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Most manufacturers sell smaller diameter inserts or end caps that reduce the sound. They tend to also reduce the low end power. Top end power seems not to be affected so much.

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