WHAT DID I JUST TURN?! please help.

[z400mayhem]

Ok so i was just looking around on the 400, and found this black circle knob on the side of the air tube where it connects to the carb.. I wasnt thinking and i turned it.. Now i dont know where it was before? It that an air valve or something? Im kind of worried..

[01boneless]

that was just the idel screw depending on what way you turned it counter clockwise tures idel down clockwire turns it up :)

[greencow]

Threw me off there for a bit i forgot the new 400 and 450s have a big black idle screw. Ha just tern it until it sounds good.