high idle when hot


2 replies to this topic
  • Bill D

Posted January 06, 2010 - 08:42 AM

#1

Need some help. When my bike is hot the idle ramps up. Stock jetting FMF Q4 slip on. BTW it's an 04 yz450 thanks.

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  • grayracer513

Posted January 06, 2010 - 09:28 AM

#2

Adjust the idle mixture:
http://www.thumperfa.../jetting.htm#PJ

Read also:
http://www.thumperta...ad.php?t=327405

Not familiar with the pilot screw?:
http://www.thumperta...ad.php?t=696672

Adjust the idle speed with the engine warm after setting the pilot. If the pilot screw adjustment doesn't resolve the issue, check for a poor seal at the carb mounting sleeve. If not that, or just because you've never checked, look for tight intake valves.

  • Bill D

Posted January 06, 2010 - 11:46 AM

#3

Cool thanks alot for your quick responce i'll try that and let you know how it goes.





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