06′ big bear 400

Hey y’all I’m new here so I’m trying to figure this thing out. But I got this bike from a friend and have been working the bugs out of it. I’ve replace the stator, battery, and spark plug with new boot. That fixed the electrical problems, but now there is a carb issue. I’ve taken it apart and cleaned it throughly several times. It is snorkeled but it still seams to be starving for gas. I’ve had to reduce the 11/2" intake down to 1/2" with the choke half on. And I also turn in the air mixture screw in almost all the way. Maybe half turn out. Any help or advice