In the pic (chux) the pressure line from the tank to carb is unhooked which means it would have had to have the carb set terribly rich to run at all. The screw going down into where the fuel line hooks up is the high speed needle (jet) and the one going in from the side is the low speed needle (sounds like this is where your problem is), clockwise leans and counterclockwise richens. SMALL moves make big changes.
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