01 wr exhaust packing

10 replies to this topic
  • beasleys

Posted February 21, 2006 - 01:18 PM


I have an 01 wr exhaust on my yz 426. I went to change the packing in the exhaust and there is not any. Is this right? Thanks

  • beasleys

Posted February 22, 2006 - 02:27 AM


Is there anyone that can help me with this or let me know where to find the answer. I already went to the yamaha website and looked at the microfiche. It didn'e help at all. Thanks :thumbsup:

  • jbrooks26

Posted February 22, 2006 - 02:33 AM


I believe this is true, the WR does not have any packing because it is a baffle type exhaust. I have never actually taken one a part to see, but I am almost positive that I have read it somewhere. Hope this helps.


  • clark4131

Posted February 22, 2006 - 06:54 AM


Pull the exhaust schematic from the Yamaha parts website. That'll tell you for sure...SC

  • Flash319

Posted February 22, 2006 - 06:56 AM


How did you get it apart? I have a wr exhaust that I cut open, but not sure of the year, I think 02. It is a sealed unit with no packing, just chambers.

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  • Yama4Stroker

Posted February 22, 2006 - 07:04 AM


This is true. If you take the end cap off, you'll see a screen welded to the inside of the canister. There is (theoretically) some permanent packing under the screen, which is not removable. I have an 02 WR426 and wanted to quiet the thing down a little with repacking, since that is not an option, I ended up getting the GYT-R quiet insert.

  • R_Little

Posted February 22, 2006 - 07:53 AM


No packing on a WR exhaust.

Get the GYTR insert for quiet

  • beasleys

Posted February 22, 2006 - 10:51 AM


Does anyone know the approx. dB for this exhaust stock an obviously with the spark arrestor. :thumbsup:

  • Yama4Stroker

Posted February 22, 2006 - 11:06 AM


I believe I read they are somewhere in the 100 to 102 db range. Never been tested without the quiet insert.

  • jaysusr

Posted October 19, 2007 - 10:29 AM


Yeah, i just learned this too. After i bought exhaust packing, i open it up, and i'm like, oops. Oh well, 21.95 down the toilet.

  • Rich_in_Orlando

Posted October 19, 2007 - 12:28 PM


Yep, an uncorked WR426 with a stock exhaust comes in over 100 dBA using the AMA sound test guidelines (3400 rpm, 20" away). With a GYT-R quiet insert it's 90-92 dBA using the same test procedures.


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