one day my blaster wasn't idling so i decided to turn a screw to adjust it.i turned the wrong screw though.instead of taking off the seat i turned a screw on the carb.it is a small flathead screw on the left side of the carb.i'm not sure what it is or what it does.it didn't seem to affect anything.what is it though?

 

It's probably the air mix screw affecting mostly the idle or low speed operation. If you don't recall where it was set some one more familiar with your ride will no doubt tell you.