does the 08 yfz have an airfuel screw? i dont see one.

it does but it is probably pluged, some come pluged from the factory, i think late 06 and up they started doing it, you have to pull the plug out

what kind of plug? metal cap? rubber piece? where do i find it?

we were jetting this bike earlier and came across an adjustable screw inside the floatbowl next to the pilot jet, i think that was the af screw but not sure, i couldnt see anything outside of it. is it on the bowl or on the carb body?

turn the carb upside down, look next to the inspection plug on the outside of the carb if you see a little brass looking screw about an inch in, you have one. if its a solid metal piece pop it out or drive a metal screw in and pull it out. if you have one and wat to replace it with something that can be adjust while the carb is in place by a new fuel screw and unscrew the old screw and replace it

will do, i'll check it out tomorrow. thanks.