studdering yz

i was riding in mexico on my completly stock yz450f on the highway and in 4th gear with 1/4 throttle open it would studder or it would feal like it was strarving for gas but it only happened when i kept the throtle in one solid position what could this be?? is it running to lean or to rich ?? :thumbsup:

im havin the same problem with my bike too. Its still in the process of being jetted. Im thinkin its running too lean but im not completely sure yet. ill keep u posted wen i get er goin.

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