Ok, Snowdrifter, does your bike idle correctly at all times? Do you have a "hanging idle" at any time - where it hangs at some higher RPM before returning to normal RPM..? Or the opposite..?

Also, could you verify the difference, if any, to removing , cleaning the connections, and reinstalling the coil?

 

Here is where I'm at..
Common denominators:
1. MCM with issue directly afterward.
2. Horrible running 4-5.5k (give or take).
3. Known working carb setups including fuel screw settings.
4. All regular and some "creative" and cutting edge checks and fixes seem to guarantee proper carb functioning.
5. Pulling choke in the problem RPM range has no effect.

Have I missed anything?

So what are the chances that both bikes caught the same 1-in-a-million electrical anomaly immediately after performing the MCM - Practically none.. Does this logic make sense? If so then this likely has nothing to do with electricity..?

 

Hit F3 and search for the word "Enrichener" in this troubleshooting listing - there are 7, and can cause all sorts of issues..
Carburetor Troubleshooting Guide

 

I'm not entirely sold on the enricher circuit / choke being the issue here. There's not gaskets or seals to speak of:

http://thumbs3.ebaystatic.com/d/l225...sulmA10UIw.jpg

Unless the plunger is bent or something.

 

The only other symptom I've experienced is the bike occasionally wanting to die when coasting to a stop, however I feel this might be a result of me messing with the jetting. I've currently got the richest setup I have installed, and might be causing it to load up or something on deceleration. Running a 132 main, Dynojet spring, and needle at 5th notch, lid on, Q4 with quiet insert. It's likely a little rich, but I was experimenting. It revs cleanly and returns to idle fine.

I can certainly try refitting the coil and checking connections. But it might be a bit before a get the time, will be busy the next few days. However I'll post my findings and results as soon as I get a chance.

Unfortunately the only thing they recommend for the enrichener is "adjust, clean, or replace".

 

Just to clarify, I suggested reading the plug after riding the bike in its' worst performing rpm range to see what the a/f ratio was at that bad spot. Your first post did say you'd changed the plug and that it was reading good-but it wasn't clear if that was after a lot of riding in or out of the worst performing rpm range. It'd be hard for the plug to look great when it's running at its worst wouldn't it? If it's an ignition problem it'd be wet, or if it's jetting/choke at that range then it'd show up in a plug check

Ideally though you'd cut the engine after some distance in that rpm range and check the plug there, rather than just ride home in the good rpm range to check it

I think you could block of the choke circuit one way or the other long enough to go for a test drive. The best place would be right at the port where it exits into the carb bore. I'd probably clean the carb with alcohol and put a large dot of very sticky tape over the exit hole.


If you blocked it down in the float bowl where it picks up gas, it could still be leaking air, though on the other hand if you blocked it under the diaphragm it may act like covering the top of a straw and prevent any further sucking of gas from the bowl?

My CV carb is back on my bike right now or I'd have a look at it.

 

I can check the plug as you suggest tomorrow after work. I'll be pulling the carb this weekend to check the choke.

 

"The only other symptom I've experienced is the bike occasionally wanting to die when coasting to a stop, however I feel this might be a result of me messing with the jetting. I've currently got the richest setup I have installed, and might be causing it to load up or something on deceleration. Running a 132 main, Dynojet spring, and needle at 5th notch, lid on, Q4 with quiet insert. It's likely a little rich, but I was experimenting. It revs cleanly and returns to idle fine."

Ok, I also coast up to lights and such. You say "occasionally", so it's probably not something to worry about? Is your idle set to 1300,+-50 rpm?

 

This is also happening to me, it's why I bumped the idle to 2k.

 

Ok, so it seems both bikes die when throttle is chopped for a coast up to a traffic light..
That is a high vacuum w closed butterfly event - and should only be fueled with the pilot system. Normally, with a properly running carb, such an issue would be solved with a proper fuel screw setting on a proper pilot jet, along with a proper idle speed setting on the idle speed screw..? Abnormally, this issue is an air leak, partially clogged pilot system component, etc..? What about a leaky choke "plunger" causing this? After all, the choke port is going to see the full vacuum signal at decel...?
If I don't have this right, someone needs to speak up..

Maybe we all should start brainstorming a quick and easy way to close off the choke port into the carb barrel...? Not sure about "really sticky tape" ....