Strange idle like poping

Today i was doing a service on my mates 04 yz 450. And when it was tickining over. it sounded like it was spitting back through the carb and the tickover would hesitate but keep running. Has anyone come across this be fore or is it just normal.

Idle mixture screw too lean...turn counter clock wise 1/2

turn ....

Thankyou ill give it ago today and you all know

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