2004 rmz250 poping

I have a stock 2004 rmz250, when i let of the throttle it backfires.

I believe there are stock jets right now in the carb.

If i run the bike with the choke it runs a lot better and dose not backfire.

I guess this means i am running to lean, what is the stock jet sizes and what size jet should i go up to.

Could i just turn out the fuel screw, but i am worried about overheating if i don't have it jetted properly.

I also ordered a 42 pilot, would this solve it how many turns out on the fuel screw should i go with a 42?

helpp

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