ok, so i rebuilt my carb. tore it all down, dipped the parts overnight. got it back together, and it runs good. before i tore it apart it seemed to always idle high (like 1200 rpm) it seems ok now but still a little high, i adjusted the idle screw so it sits around 800 or so. any lower than that and it wants to idle rough. i dont have any idle air mixture screws. this quad does not have them. i can see where they should be but its like they filled the hole in from the factory??? weird. here is a picture of what i mean: you can see in this picture where both screws should be. also, this thing was not hooked up before i rebuilt it.. what is it exactly?? the thing im holding in my hand is what i am talking about. is it ok to leave it off? the wire is there for it on the engine, but it was disconnected.