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Welcome back Allen. It honestly sounds like the engine has seized. I would take the head off exposing the piston and cylinder to see if there is any damage inside the cylinder walls. And maybe go further into this by taking the cylinder off completely. But prior to any of that make sure your not missing something else like the starter bearing or in the stator coil area Did you drain the oil? I have the same bike and it’s reliable and tough. But if there was no or low oil well that’s that! Hopfully you will find out and keep us posted. I’ve been a little busy since I opened up my own company but will try to check in from time to time. Goos luck.

OK. .Sounds like you need to pull the carb and clean it . .You likely have a plugged high speed circuit. either the main jet or passages . The idle air screw should be on the side of the carb rather than the bottom. It is definitely too lean under load off idle.. I believe that carb has a diaphragm that opens the main jet . Check it for holes too. Changing the setting on the idle air screw should have large effects on the quad running . .in fact , it turned in too much it should stall. That's why I suspect the screw you were turning was not the idle air .