fast idling

3 replies to this topic
  • jimbo101

Posted November 16, 2011 - 03:32 AM


After riding my 07 yz450f my idle speed picks up significantly, should i just adjust the idle speed or is there something else going on?.... also hard to start from the get go....

  • clark138

Posted November 16, 2011 - 06:55 AM


try changing your pilot jet.

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  • grayracer513

Posted November 16, 2011 - 07:16 AM


If you have never set your pilot screw mixture, you need to start there:


It is normal that the engine should isle better/faster when warned up completely, but it should not be a big difference. If the adjustment above doesn't fix things, look at your valve clearance.

  • idahoexcr500

Posted November 17, 2011 - 06:23 AM


also make sure your fuel screw is seated right. There is an oring and spring that seals it where it screws into the float bowl. If you installed an aftermarket fuel screw this might be an issue.

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