hanging idle

[canuckxxx]

One last thing to check, with the points, is the timing for 1-4 vs 2-3. it should be the same for both, but may not be because the 2-3 points are on a separate sub-plate from 1-4.

[KEITH KRAUSE]

I once had a similar "hanging idle" issue that was also electrical related.
When my bike was 1 year old ('79 GS1000E), I converted the points to a system made by Martek. It used a collar that slipped onto the shaft and was held by a small set screw. The set screw came loose and allowed the collar to rotate. I'd pull up to a stop and the rpm's would hang about 400 rpm's higher. If I "blipped" the throttle, the rpm's would quickly fall to normal idle (1,000 rpm's) and stay there as long as I didn't touch the throttle. It had me confused for a bit but since the Martek system was just installed a few weeks earlier I kind of suspected it. I ended up tossing the Martek for a Dyna system.
Though the slipping collar mimicked an intake leak, the difference is a true intake leak will result in a constant higher "idle" when the engine has reached full warm up. Blipping the throttle won't settle the rpm's beyond a moment or two, if that.