Ok, so I have had this 06 kx450f for about a month and it suffers from the normal hanging idle and off idle bog. I was planning to do the o-ring mod and adjust the fuel screw. As I was taking the carb off to do the o-ring mod, I noticed the air/fuel screw was missing. Then I shined a light into the hole and found this. Apparently the guy i bought it from had either stripped the hole or broke the screw off. can you tell me if thats the screw or if its just stripped out and give me a possible way to fix this? The piece with the arrow pointing to it goes up and when i push it like a spring. that is why i think the screw is broke off.