high idle when hot

2 replies to this topic
  • Bill D

Posted January 06, 2010 - 08:42 AM


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


Adjust the idle mixture:

Read also:

Not familiar with the pilot screw?:

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


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

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