Yz400f wont start with the kick

Recently my bike wont start by kicking it, only by towing, and when it starts it runs great. Im no beginner by starting this bike so i know how to do it. Before it was really easy to start, but now impossible. Whats wrong with it? No throttle and choke when cold and no choke and no throttle when warm worked before. image.jpg

maybe fouled plug or turn screw on carb and drain any old fuel out carb try that if u havent already

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