13' Honda crf 50 won't idle when cold?

My son's Honda CRF50 won't idle when the bike is started cold even with the choke open so I have him hop on right away and ride, no problems when it's warm. Bought the bike brand new last November. Was told it may not have enough air flow the way the air intake is built with all the California regulations. Don't know much about bikes and just started riding myself so any info would help. Thanks

Turn up the idle screw

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