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Muffler Insert


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I called my dealer and he didn't have this part. He contacted Yamaha to get more information and was told that it will be available after February 26th. $39.95. He was not able to verify ratings for the insert (sound levels) but was able to confirm that this will fit the WR250, WR426 and WR450 models.

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On another note...I emailed Mike Hobbs, the writer of the article regarding the muffler insert and this is what he had to say about it:

I only got to ride the WR250 under the watchful eye of Yamaha and my

estimation is with the insert it was about 93db. Very quiet but made good

power. Without it probably around 97db, of course I didn't have a meter to

test the sound levels.

Mike Hobbs

Isn't the stock insert rated somewhere around 92db?

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  • 2 weeks later...

As vtcyclist stated earlier, these muffler inserts are now available. I contacted my local dealer and they're available from Yamaha's California warehouse. $39.95 + tax. I ordered one and it should be here next week. I hope they do a good job reducing noise without sacrificing too much performance. ?

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This is a great looking insert at a great price. If it lowers sound levels effectively it must be very technical. I say that because a vortip with a ninety degree down turn and smaller? opening will probably get you to 94 to 97 on a WR450, and much of that comes from the downturn.

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