Carbs backfiring, plugs rich, stalling at idle

[azr]

reset the floats to between 23 and 24mm, checked each float needle, they all looked fine. Started the bike up and she's backfire a bit and bogging while idleing as well as running rich. I have to have the main idle far in to have the bike idle at 1000rpm. This is nuts! I've fixed so many things on the bike it should be running like a top but it remains to run rich and backfire into the carbs. I don't have a colortune but maybe having one will help (but I don't think it will solve this problem). I'll do some more research on here and see what I can find. Anyone have anymore ideas??

[Addy Leung]

I am not an expert but just hope my experience working in my poor GS1100 can help.
I have two tips want to share. hope it is not repaeted in other menber's pervious reply.
1/ The two 20 years old ignition coils may be the time to replace with a new one, Dyna or Accel may be a good choice.
2/ The three pieces of the needle valves in the carbs need to check carefully. They may be worn out. There is an O-ring attached to the needle valve seat. If it is worn out, it will cause flooding the carbs and leaking when under engine runnning condition (under vacuum pressure). (refer to the item 34 and 35 in this CR carbs from Sudco link http://www.sudco.com/Diagrams323728/expcr.gif )

[azr]

Problem fixed

So I go into the timing again and this time check the points with a multitester. Turns out I am getting power to both points at the same time. So there is a short somewhere. I trace it as far as the harness going towards the tach/speedo and figure this could get ugly so I just unplug the two wires white and black and yellow and hook them directly to the coils by splicing them with the two orange wire from the coils and WHAMO!!! no back firing, no bogging, she ran and pulled like I've never seen her before. If I ever get ambitious I will trace down the actual short..maybe.