..or an air leak which constitutes a fuel problem.
If you have an air leak, pulling the choke would restrict the flow of air from the intake, because air is seeping in from elsewhere. Also, if your jet circuits are in fact clear, they would be of insufficient size to compensate for the additional air. If you are throttling it a few times before kicking cold it could help to richen things up a bit and negate the need for choking it rich. After the motor warms to the stoich balance everything is out of wack, and you have to reduce the air coming in somehow. With either the air screw or the choke. Just thinking out loud, I’m no carb expert, they’re a pain in the ass. The only reason I know anything about them is because they are always demanding my attention. Fekn gas toilet.
If you run the air screw in does it get better? Same?
Plug look lean?