My 1995 honda cbr 600 is great, but lately i have been having trouble with idling. I adjust the idle to 1500 or so rpms and after a few minutes it falls off to a lower rpm and eventually kills out. if i adjust it to 2500 rpms eventually the same thing happens. I have to twist the adjustment almost all the way open to keep it idling. Then after awhile it is like it opens up and the idle suddenly shoots up to high rpms, sometimes as much as 5000-6000. Not sure what is causing that, and help would be appreciated.