A muffler is a metal cylinder at the tail end of a dirt bike's exhaust system, and is in place to reduce exhaust noise. One type of muffler, most often used on dirt bikes, is filled with fiberglass sound-deadening material surrounding a metal core with holes in it. The other type of muffler is filled with a baffle. A baffle is a metal cylinder that looks like a honeycomb with holes in it. The exhaust is pushed through the baffle channels, which breaks up the exhaust pulse reducing the noise.

Remove the Muffler

1. Step 1

   Take off the dirt-bike seat using the appropriate sized socket to remove the two bolts that hold it in place.

2. Step 2

   For ease of access to the muffler, take off the right-side number plate using the appropriate sized socket. There are two bolts to remove.

3. Step 3

   Loosen the bolt that attaches the muffler pipe to the dirt-bike frame.

4. Step 4

   Tug firmly on the muffler to pull off the pipe. It connects to the exhaust pipe simply by slipping on.

   Replace the Muffler

5. Step 1

   It is sometimes necessary to replace the headpipe-to-muffler seal that fits between the muffler pipe and exhaust system pipe. Fit the replacement muffler and seal firmly into place.

6. Step 2

   Tighten the bolt that attaches the muffler pipe to the frame. This is the muffler clamp, and it also holds the seal in place.

7. Step 3

   For ease of access to the muffler, take off the right-side number plate. There are two bolts to remove.

8. Step 4

   Reattach the right-side number plate with its two bolts.

9. Step 5

   Reattach the seat by with its two bolts.