Need Help with new exhaust on WR 400

1 reply to this topic
  • builtduramax36

Posted February 08, 2015 - 06:30 PM


I have a friend who is parting out his 2001 Yz 250f.. he has a pro circuit t4 pipe on it he says he wants 50 bucks for. Would this bolt up directly on my 99 WR 400? Couldnt pass up this deal/ I have a stock head pipe also. Any help would be appreciated.


Also, If this exhaust works, what should i do for jetting/fuel mixture? thanks

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  • Birdy426

Posted February 10, 2015 - 12:33 AM


Nope.  Head pipes are different diameter...


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