yz400/yz426 silencer

2 replies to this topic
  • fershy

Posted May 12, 2000 - 07:01 AM


I am looking to install a YZ silencer on my 99 WR400. I am wondering if the 426 silencer is the same as the '98/'99 YZ400 silencer?
Somehow I thought I had heard that the exhaust diameter is different on the 426? Does any one know for sure or can confirm different part #'s?

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  • kcjames

Posted May 12, 2000 - 09:07 PM


I don't know about part numbers, however it appears the outside diameter of the exhaust pipe inside the silencer is different. I found this out by buying the exhaust kit from BMP which was designed for a YZ400. There's a base piece that bolts into the muffler. There is a hole in this base which the exhaust pipe passes through. I had to have this hole bored out by about an 1/8" to accomodate the YZ426's exhaust pipe. Don't know if this helps, but that may be what you heard before.

  • alexjoz

Posted May 14, 2000 - 02:41 PM


Hey KCJames, What did you think of the BMP Spark Arrestor Kit? It looks like a good idea. How was the power and Noise leve? I need something quiet when I head up to Michigan to do some trail riding. Is it a quality piece? THANKS!

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