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I've got a hole in my air on my 97 Polaris 300 Xpress approximately 1.75" x .75".. I have searched the Ole internet and found a ton of conflicting answers as far as how to seal it properly. It is directly next to the carb intake port and there is a ton of suction. Any advice would be greatly appreciated...

Howdy all, new to the forum, forums in general, and 2 strokes altogether. I have a new to me 97 Polaris Express 300, it has been bored .30 over, running 40.1 premix, oiler lines are blocked off. I admit my ignorance of 2 strokes and I'm Louznmemind with this thing.... I cannot get it to start without holding the throttle wide open and it will not idle on its own no matter what I do. Once I get it started I have to hold the throttle slightly open to keep it running, it will go into gear and SEEMS to run good all through the throttle range, it screams at WOT but when you let off it wants to bog out, it will keep running if you keep bumping the throttle. The carb has been taken apart and cleaned although it looked brand new inside when I took it apart. The main issue it had when I got it was it would pour gas out of the overflow as soon as you turned on the petcock, I replaced the petcock and adjusted the float height, I also replaced the float needle and seat but I'm not sure I have the float height correct. Is there a process to adjusting the float height considering it is made into the float bowl? Could this be my issue or should I also look elsewhere? I have tried adjusting the air screw to no avail, even at 1/8" intervals but the idle never changes at all, what is the default setting for this screw as well as the idle screw? I apologize if this is confusing or if I missed giving any necessary info but I will do my best to clear anything up if someone could please give me some advice.