Just bought an '85 XR600, when i twist the throttle it stays put. There is no snap back when i release it. I noticed there are 2 cables going to the carb, one looks like some kind of return cable? I have lubricated the cables and that seamed to help just a little bit. Do i need both cables? is the return spring history? anyone experience similar issues or any suggestions on making my throttle snappy. thanks everyone, love the site!