2004 yz450fs backpopping,poor idle

3 replies to this topic
  • freewill

Posted December 20, 2009 - 04:09 PM


just got an 04 450, has low hours,it is backpopping when i let of the throttle,also seems to be running hot,and idles very poorly, i havent dug into anything yet.(specific) help to point me in the right direction would be greatly appreciated.:moon:

  • 426 NOOB

Posted December 20, 2009 - 09:10 PM


clean the carb, the pilot jet more specifically. That will clear it up.

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  • eazrider

Posted December 20, 2009 - 09:26 PM


Make sure the hot start plunger hasn't corroded and is NOT stuck in the "open" position...oil it and the cable up well, water runs down the cable from washing, and corrodes the aluminum carb body....

  • freewill

Posted December 21, 2009 - 08:17 AM


will do thanks a bunch,yup you were right the pilot jet was completely clogged up,bike runs and idles like it should thanks again

Edited by freewill, December 21, 2009 - 12:33 PM.

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