kx80 over rev when started!?

Ok. im new to this sight. heres what i have. 92 kx80 big wheel. was running fine. then all of a sudden started running like garbage. It was hard to start and when it did it would run for about 30 sec and die some time i could feather the gas to keep it going then it would not move when i clicked it into gear. took it back to the shop and found the clip holding the needle in place was bent and caused the needle to be out of pushed up. i fixed that but now when i start it it seems to over rev out of control. i immediately hit the kill switch. the thumb screw on the side of the carb does not adjust anything. ive checked for air leaks. etc.. sorry for the long story hope it makes sense. thank you for your time.  

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