Need help with my 2000 kx 125

When i start it up it idles fine. And revs fine while idling in neutral or when the clutch is pulled in. And i am able to fully open the throttle when idling and revs high bit when im in first and i get going if i open the throttle it bogs out and dies? What is causing this?

Something in the carb.  Could be plugged jets or a dirty carb.  Has the bike been sitting?

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