i have a 1992 ex500. picked it up from a friend a few weeks ago on trade for an old dirt bike. problem is, i can't get it to idle. it'll start fine with the choke, but idle at a ridiculously high rpm. if i take the choke off, the motor wants to idle at 3000 rpm. if i turn the idle down below 3k, it instantly dies. i have taken both carbs apart and cleaned them. i've been riding dirt for years now, but i'm kinda new to the street bike world. any suggestions would be greatly appreciated.