Oh, my! You too have "Acer" monitor.

About carbie: it is CV type, and you must to screw all the way both jets - no adjusting there. On a fourth pic is the screw you need. But before you start to adjust anything, disassemble carb, clean it and check is his diaphragm in one piece, is needle where it suppose to be, and also manifold between carb and motor head.

And then, screw No.4 pic screw to the end, and unscrew for a 1 1/2 turn, and after that (or even better - before), look on the Internet how to tune CV type carburetor (there are tons of pictorial, textual and video manuals on the subject) because my English is about to collapse... here and now.