I recently purchased a '78 CT70 that would only run when the choke was fully on. Everytime I turned the choke off, the engine would die. I am no mechanic, but feel like I can usually get these problems fixed. I took the carb off to clean it and make sure the jets looked good. Upon taking the carb off i noticed a little corrosion in the fuel lines from the tank. The carb, much to my surprise, was fairly clean and the jets looked decent as well. I gave everything a good cleaning and reinstalled the carb. Since everything looked good on the carb i figured my problem likely is due to the fuel lines being partially blocked from corrosion in the tank. I took the tank out of the body of the bike and cleaned the inside of the tank and put new fuel lines from the tank to the carb. I got everything reinstalled and when i went to start the bike the engine ran full throttle. I figured i reinstalled the throttle slide 180 degrees wrong into the carb body. I turned the throttle the correct way, the the slit in the slide facing the idle screw and it still ran wide open. I unscrewed the idle screw, almost completely out, to make sure that wasnt rubbing on anything. Didnt fix the problem. I disconnected the carb from the air intake and fuel lines, but left the throttle connected to see if the needle was moving correctly and everything seemed correct. Does anyone have any addition checks for me to resolve this issue?