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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?

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I'm at sea level with an 06 aswell . I'm running 48/170 and I need to go to a 45 as I'm usually around one or less out on the fuel screw. You must something going on.

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Is your bike hard to start when warm ? Do you need to use the hot start ?

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I just had the carb rebuilt and i put a 48/170 in it. It was popping really bad so that's when I put the 52 in it. I also just replaced the header pipe and the exhaust gaskets. Also it starts easy even when hot.

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