2011 250 six days stalling bogging

My 2011 250 six days is not running well since i bought it from a KTM dealer this year.

Starts easily and with choke on runs fine. Once choke is off runs for a minute or less and dies.

Hard to start after that and once going it lags and boggs.

If i stop bike will stall and be hard to start.

Has been to KTM dealer I bought it from twice.

First thought from them was a valve but then decided it was dirty carb and jetting.

They said it ran great both times they gave it back.

Any ideas??

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