KB, Wow, just Wow.
You amaze me.
Really not meant to amaze anyone. As a Chrysler mechanic back in the early 1980's, the entire Chrysler, Dodge Plymouth line up had a "Lean Burn" system which was early computerized Ignition and all the cars idled like crap. It almost became the demise of Chrysler. As a tune up mechanic, I was constantly under the gun to "fix" these rough idlers, so I had to come to understand why they had problems and figure out what to do to get them to run so the customer was happy and get the Service Manager off my back. I developed a greater understanding of the issues because if I didn't , I had to deal with a whole bunch of very unhappy people.
Chrysler used Carter 2 barrel and Thermoquad carburetors. I studied them to death and got really good at figuring them out and overcoming their short falls.
35 years later, here I am reading posts on this site over and over and over about all the issues with the Mikuni BSW32 carbs and it brought me back to my early days with the Chrysler's. So I did what I had done before. Take them apart and study them to death, one circuit at a time.
My nuclear experience raised my understanding of what it meant to be a "mechanic" In nuclear, you can't work on a system without understanding how the system works and then "apprenticing" with a Journeyman qualified on that system. I took that understanding and applied it to my Automotive Technician Licence and realized that as a certified mechanic, I knew how to take cars apart and look for damaged parts and replace them to get the car back on the road. That attitude would never fly in nuclear, so I came to realize that most everyday mechanics are really good at "putting a band aid on a cut" but don't trust them to diagnose a "cardiovascular issue" and fix it.
I've spent countless hours studying these BSW32 carbs to better understand "how all the circuits work" in an attempt to better understand why these carbs are such a problem. If I had to guess at how many times we talk about carbs on this site, it would probably be north of 80%. And that is shameful in my mind. This site should be more about how to overcome the parts non availability, like what to do if an igniter craps out and there's non available. Or how about updating to a standalone computerized engine management system.
Scotch and I "discuss" thoughts/ ideas about the carbs and I know Scotch has spent more time studying/working on these carbs than I. I have great respect for his abilities, especially with the carbs. I try to hold off replying to these drivability issues but understand that when members post looking for help, somebody needs to jump in and offer up thought provoking answers and I guess I can be something of an air hog jumping in. I really have to work on holding off and letting others in to assist.
I could easily see a 40 page tutorial on all the circuits in these BSW32 carbs and it would be more than the average KZ1300 owner would want to understand, so we tend to just address each issue as it comes up and hopefully, what we provide is enough to fix the problem. For those that keep following along all the issues, I'm sure some of you have picked up tidbits that have raised your understanding of these carbs and will help you along the way and that's all I could hope for.
Cheers,
KB