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