back firring

5 replies to this topic
  • 450high

Posted May 20, 2007 - 03:39 AM


03 wr 450 , when i close the throttle to slow down my bike backfires.Not every time but a fair bit.Any ideas?
Thanks dave

  • gregwr450f

Posted May 20, 2007 - 04:39 AM


leaking header.

  • MountainMax

Posted May 20, 2007 - 05:41 AM


turn up your fuel mixture screw out another 1/2 turn, should fix it

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  • face_plant

Posted May 20, 2007 - 10:51 AM


LOL i love the backfire it keeps SUV's off my rear fender PPPPPPPPPPPPPPPP

nothing like a flame thrower at a stop light P

  • Pooley

Posted May 20, 2007 - 11:27 AM


Not sure of the WR model years, but some bikes had an enrichening circuit on decel that caused this. I KNOW it has been talked about since I've been here, but can't say for sure.

  • Yamaster

Posted May 20, 2007 - 11:46 AM


I dont know if the 03's had it but it may be the emissions system. It is not too big a deal, but if you richen the pilot circuits it should go away if you dont have the emissions stuff.


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