CB1100 Idle speed instability problem

[dave]

From my experience in the automotive world, it was (and is), common for some multi-port fuel injected vehicles to be plagued with a carbon sludge deposit that forms around the throttle plate. This would cause uneven or low idle, sometimes dying, and a hesitation on acceleration in some cases.
I am pretty sure that this would usually only happen with an average higher mileage than most of us have on our bikes.
The fix was to open the throttle and clean around the bore where the throttle closes, and the back (inner) side of the throttle plate. The most sparkly clean results come from pulling the throttle body for thorough cleaning, but i had good luck with a toothbrush and some Berryman's Chemtool.
If I were plagued with this issue, I would try to access the throttle bores so I could assess the possible accumulation by opening the throttle and wiping a q-tip around the area where the throttle plate closes, if it comes out clean, that's not the problem.

Ben

Ben70 may be on to something here. 2 1/2 weeks ago while riding some open, desert (Anza Borrego) roads I opened the throttle WFO several times while doing passes on slow moving traffic (most of it Harleys). Had the wife on the back (she only weighs 125 lbs) and the trunk had some gear in it, so it was WFO for several seconds. Ever since this day I have not experienced the low RPM idle stalling or the high (1,500) RPM idle. Now I admit, I baby this bike, and it's been longer than I remember to when I had this bike wide open. My passes were done in 4th gear, and I held it wide open from about 2,500 RPM until I reached 6,000 RPM, then I shifted into 5th gear and held if wide open some more. Now I have only had my bike out three times running short errands since this ride, so I can't say that the problem has gone away for good because it comes and goes as it pleases. But maybe when holding it WFO I cleaned some gunk out of the inlets? What do you guys think? Can somebody else experiencing this problem either try the WFO trick, or follow Ben70's suggestion and report back? I think with the engine running it makes a difference. I am riding my bike tonite, and I will keep this post updated.