yz400 exhaust

4 replies to this topic
  • burto644

Posted July 18, 2006 - 01:39 AM


i have a 98 yz400. does it do any damage to the bike running the exhaust with no muffler packing, or does it simply make the bike quieter. cheers sam

  • theclone

Posted July 18, 2006 - 10:43 AM


Yes, running the bike with no packing is very harmful. It reduces backpressure which the muffler bearings need to operate properly. Once the muffler bearings are shot, you might as well buy a new bike because they are so expensive to replace.

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  • jimbob69

Posted July 18, 2006 - 07:52 PM


I don't think it will do harm, but it will be louder and sound horrible. Pack it, help keep our trails open. Your bike will also run smoother and crisper and u might get a little bottom end back.

Pack it, period.


  • burto644

Posted July 18, 2006 - 10:45 PM


looks like im packing my exhaust. thanks guys

  • One Louder

Posted July 19, 2006 - 06:20 PM


Repacking my Big Gun muffler did affect how the bike ran in a positive way, not to mention the noise factor. A well packed muffler make the bike sound mean :thumbsup:

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