09 CRF 450 Sputtering/Running super rough.

The other day a friend and I were cruising some trails on our way to a private track, I took off down an open field and higher up in the RPM range it started cutting out, sputtering, and such for about a second or two. Almost like it was running out of gas. Gas level was fine, after that it started doing it every time I would hammer down. Also, when Idling it is idling really, really rough.

Any Ideas?

fuel filter, common problem, clean it before you have to buy a new fuel pump

Check the plug too.

valve clearances at the same time

Thats what I was thinking, thanks a ton guys!

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