Hey guys I am at sea level and have 2006 yz450f with a 52 pilot and 170 main. Has terrible popping on decel until I get the mix screw out to about 3 1/2 - 4 turns then runs great. But the screw fell out from the vibration. So it Seems like I need a bigger pilot but a 52 is already bigger then what anyone is using on what I think is a stock bike, that I've talked to. Could anyone please tell me if this seems right or could it be something else?