I'm getting the drifting idle on my '06. Gets faster as the bike gets hotter, and seems to hang at high rpms. In the past, I've associated this behavior with a vacuum leak, possibly through the carburetor mount boot.
But, I also figure that when a manufacturer puts a KNOB on the idle adjusting screw, which is easily accessible from the saddle, such as is on my GZ250, they may be telling riders that they KNOW from the Get-go that idle is going to drift, and are giving you a work-around.
Because, a lot of machines do NOT have a knob on the idle adjustment and bury the adjuster somewhere very inaccessible.
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