need help YZ400 dead spot

I just purcheed a 98 YZ400f, It starts fine but when you are shifting it has a dead spot, or when idling and floor it, it falls on its face, if you ease into it its fine. My buddy has one and his is very responsive. anyone have any ideas??? thanks.

jet it. and possibly check to see if the accelerator pump on the carby is still there or at least intact and functioning properly

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