250F Backfiring problem

So I’ve got a 07kx250f. When I bought it it didn’t backfire or pop or anything but I bought the max fuel screw to adjust the carb. When I replaced it and had it installed it now pops and cackles when I left off the acceleration. I’m not sure if the black o ring that goes before the spring on the fuel screw is stuck up in the carb or it fell out but Ive taken the screw out and re installed it just messing around trying to find my issue. Kinda stumped at the moment. When I spray carb cleaner around the boots it’s not causing it to die or run rough. Any ideas of what’s causing it? Am I sucking air somewhere? Any idea of how to fix my issue would be appreciated
 

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I’m not sure where the stock fuel screw was. I’m assuming around 2 turns. I’m pretty sure it’s at like 2.5 right now but I’ve messed with it and had it anytwhere from 3.5 to 1.5
 
I’m not sure where the stock fuel screw was. I’m assuming around 2 turns. I’m pretty sure it’s at like 2.5 right now but I’ve messed with it and had it anytwhere from 3.5 to 1.5
You can always put the stock air screw in and see if it goes away. If so, than see what the turns are. Maybe your new adjustable air screw is not seating correctly.
 
Yeah I was going to but my girlfriend swept it up and threw it away lol
That's cool you have your girlfriend cleaning the garage behind you. Not sure why this was on the floor to be swept up though. Did she sweep the floor right when you put the part on the ground?
 
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