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2005 crf450r backfiring/popping like crazing!

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so heres the deal i picked my 05 crf450r used a few months ago... bike runs great but i first noticed it backfires pretty bad which i didnt think was normal. I have also come to the conclusion that when the temperature is really hot out like in the 80's it barely backfires only sometimes? As soon as it drops to 70 or lower its like the the worse it gets and its really annoying? the second you let the throttle off it starts goin crazy!

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When its hot outside, your fuel/ air ratio will be richer, thats why its popping less when hot out. As suggested, adjust the fuel screw, come out with it, richer, 1/4 turn, test ride.

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