I have a particularly difficult problem. One day I rode my bike into work and the bike ran flawlessly. Later in the afternoon I went to ride it back home when the first stoplight I came to the bike would not idle down. It stayed at about 3K rpm. After making it home I tore the bike down expecting to find maybe a stuck throttle or idle adjustment out of whack. The throttle works fine (new cables 2 mos ago) and the idle adjustment was where it was supposed to be. I have to admit this has me baffled as to why in a matter of a few hours the bike just decides to idle really high. I have checked all the obvious things like the throttle cables, linkages, air vents, air filer, ran a new tank of gas through it, the choke and the bike had not been sitting having been run the day before. I have found nothing out of the ordinary. I have searched the web looking for information on this, including this site and have found a few others who had the problem or the symptoms I am describing. But no solutions or probable causes were given. So I am asking the good folks here if anyone has come across this or knows what might be the possible culprit. Failing that I may have to admit defeat and take it to the mechanic.