I get that clutch chatter sometimes at low speed in traffic, plus the clutch plates stick after sitting overnight. I had the clutch apart not so long ago, mostly to see what I had in there. Some of the middle friction discs had a dry spot where there clearly was no oil, and some of the middle metal plates had a dark dry area where there wasn't any oil either. Maybe time for the Hondaman clutch mod; I will be looking at it again this winter.