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Drz400s 2002 jetting problem help please *Eddie*

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Hi, I have a suzuki drz 400s 2002 with a full yoshimura rs-3 offroad. I have a UNI filter and the airbox cut 3x3. 4th clip for the needle, main = 142.5 (stock) and pilot= 22.5 (stock) fuel screw turns = 3 1/4.

My bike runs good when the temperature is hot and beautiful. When the temperature is too cold or the air is wet, my DrZ does a lot of backfires. When I stop at the light, the idle doesn't keep my bike open and he stops automatically. I don't know why....

Maybe I will put a 25 pilot? or a main jet 144 or 146DJ ??? If I put a 25 pilot, fuel screw = ???

Please Help me !

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