I have the same problem with the idle after stopping. if I'm cruising and pull the clutch in and stop it does that but if I downshift and brake it pull the rpms down and it sits at 1k-1.2k like it should. So i would like to know how to get that fixed as well.
+1 same with my '71 CB500. I'd love to know how you fix it.
I don't have if fully resolved, but my plan of attack is to start with new motion pro throttle cables. The crusty 20 year old ones just aren't that great.
I think the cable is to blame because I unhooked the cables and the bike idle would go right to around 1,700 or so. My tach is pretty lousy as well could be a +-300 rpm.
Also the drilled air screws are pre set and non adjustable. Filling these in with solder or jb weld should allow the bike to idle around 1,100.
My advance is not the greatest either and has a slight wobble with affects tune as well. Maybe my advance bolt got bent?
So a few things to fine tune yet.
The extra parts will be for sale soon so keep an eye out for that.