When you make the adjustment, you are just taking up slack in the cable. If you touch your thumb throttle, without starting it, there is probably a little play in it. If there is no play in it, then yes it will idle really high(like your pushing the throttle). But I haven't had that problem on the 4 quads I have done. I think if you go do yours, neither will you. And if you have trouble , just ask.