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.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 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.

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.