I have a 1980 model with a professionially rebuilt carb per the previous owner. Bought it with the running issue described in thread title. I pulled the carb, checked the rubber/metal carb to head spigot for possible cracking/leaks, checked the main and pilot jets for obstruction, and reinstalled with a fresh gasket between the spigot and head. It will start easily with choke and as it warms, the choke can be decreased to about 75% off but no more, it will die. Trying to rev it while pushing the choke to completely off doesn't work, it will die, even when warm. I take this to mean it is getting too much air. Should I experiment with the air pilot adjustment? It is located downstream of the slide. It is currently 2 turns out from all the way in. I confirmed it has the correct main jet but I didn't check the needle position. The accelerator pump works. I don't know if the float level is correct and it might be the last thing to check anyway. Any advice?