Hello FastF3,
I am first time user of this site and decided to sign as I am having the same problem with mine. It's an 05 king. I'm afraid I don't have an answer to the problem and I've also done the service upgrade still no change. I've quizzed an awful lot of service people about the problem but as yet I don't believe anyone has nailed it. Mine has been parked over winter and I haven't worked on it any further but I think I know what I'm going to try first. Mine doesn't code on the computer either.
On the throttle body there is a stepping motor that is told to open and close by the computer to deliver the correct amount of air for the fuel mix. It is very similar to the sytems found on todays vehicles. I have worked on vehicles that were acting much the same and it ended up being a dirty or defective stepping motor. I believe that the stepping motor is functioning but not properly. I will be removing this part in the next month or so to inspect and clean.
There is a great breakdown of all the parts for this bike. The site is called alphasports. The part numbers quoted are actual suzuki numbers. I use it for parts ordering at a local dealer. Saves time and you get the parts you want instead of them telling you which ones you need only to find out they were wrong. Hope this helps. Let me know. If it works for me I'll let know.
