Quote:
Originally Posted by stevehipkiss
Please dont guess..you either know about these things or like me,you just guess, my guess being it needs a different jet.... 
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Not sure what you mean by hunting - fast changes or slow? Normally hunting refers to quite rapid changes and most people experience slower rpm changes at idle.
You wont get many replies if you dont want guesses because this has been the source of much debate and no one is 100% sure. Many bikes have the problem and plenty others don't. Guesses have been:
Pipe
Squish
Needle jet wear
Float height/vibration
Sensitivity to temp change
Spooge build up during long idle