Screw Out to richen it, screw in to lean it off.. Get it warmed up, turn the idle down as much as possible without it cutting out, then try and get the tickover as high as possible only just using the mixture screw itself.. Err on the rich side... Then adjust the tickover screw to suit... That is how you correctly adjust the fuel mixture 😉
So I put a new carb in and it puffs a little black smoke if you give it throttle. Reading your post i need to need to adjust counterclockwise with that screw until there is no more black smoke? Thanks