I may have seen a small amount of smoke near the passenger side of the firewall. Is that what you are referring to?
If it is, I suspect it is coming from the starter or a wire at the starter. If you crank it for an extended period of time, it will get really hot. Check to see if that's where it is coming from. Remember, it could be the wiring to the starter as well.
I need to see a pic of the screw you are referring to. If I recall, there really aren't any adjustments on the top. The air/fuel mixtures are usually at the base of the carburetor.
Just for curiosity, will it start if you use starting fluid?
Let me know.
Saturday, February 13th, 2021 AT 6:41 PM