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Engine missing @ 1/4 - 1/2 throttle

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Just rebuilt the top end of my 2009 yz450f. The engine misses at 1/4 - 1/2 throttle. There is no hesitation. It has a brand new spark plug. What should I adjust?

 

Timelapse of the rebuild if you are interested:

 

Edited by Jamieyz

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