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Old 12-13-2012, 07:28 PM   #13342
Joined: Mar 2012
Location: Marana, AZ
Oddometer: 43
Check the clamp on the boot on the engine head. I had the same problem on my 450X. I found that clamp was loose allowing for an air leak. 60+ mile ride after that with no idle issues. I love simple fixes.

Another thought is maybe the thottle position sensor is bad or a loose connection?
'05 CRF450X
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