I forgot to tell ya, Loosen the small set screw at the carb's blue bezel ring.... this will allow you to turn in the low speed screw. If you don't, it will bottom out the blue bezel to the carb body and not allow you to make a leaner adjustment.

Most people just pull the blue PITA off anyway... leaving the black low speed screw stub sticking out. I'd just do that if I were you. I did just that yesterday.