Silencer repacking

9 replies to this topic
  • Mxer303

Posted February 22, 2001 - 10:46 PM


I noticed that my 00 426 is louder than my friends 01. Is there a way to repack the silencer on it? Rich R. had said that they use a different type of packing on these silencers. Any suggestions?

  • Le_Racer

Posted February 22, 2001 - 11:03 AM


Repack that silencer, you will notice a much improved response off the low end and gain a little all the way up.
I've used different kind of packing and the best I found is the original Yamaha packing that I got with my 2001, ready to put in with the stainless wool and screen like the one fitted at the factory.

  • yzernie

Posted February 22, 2001 - 08:05 PM


I have used stainless steel wool to repack. It works great and lasts 10 times longer than anything else I have tried. It was recommended to me by Larry Roeseler and he knows 4-strokes!! Pack it as tight as possible.

  • teggers

Posted November 11, 2001 - 10:41 PM


I tried steel wool and it burned right through my pipe, number plate-and stayed burning on the track. It was a night race and at least I got a lot of time on the PA....

Anybody got some real (permanent) ideas/solutions for silencer repacking? I've done it about ten times... I end up just buying somebody's old silencer.

  • fershy

Posted November 12, 2001 - 05:24 AM


teggers, next time try stainless steel wool~!

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  • yzernie

Posted November 12, 2001 - 12:36 PM


Originally posted by teggers:
Anybody got some real (permanent) ideas/solutions for silencer repacking


Unfortunately, there is no "permanent" solution for muffler repacking. These bikes put out such a hot exhaust that anything you put in there will have to be replaced eventually. The stainless steel wool will last much longer than any fiber packing....even the Yamaha stuff. I can get about three months out of mine and that includes practicing once or twice a week, play rides with the wife and kid and racing almost every weekend. That is about as "permanent" as you can get.


  • mxcowboy

Posted November 12, 2001 - 03:26 PM


I just installed the moose racing silent sport repack cartridge and it's working pretty good so far, was easy to install....check it outweb page


Posted November 13, 2001 - 12:18 PM


Does the YZ pipe have indentation under it for clearence? Need to know before I buy this one.


  • yzernie

Posted November 13, 2001 - 12:54 PM


The mid section should have some indents to clear the frame and subframe. The bottom of the muffler might have a dent on it to clear the rear brake caliper.



Posted November 13, 2001 - 03:53 PM


Thanks Ernie....


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