Alright guys, pressing on. I purchased four carbs off Ebay. All four were sold as parts carbs and I guess I was expecting more but once I received them I understood why they were being sold as parts carbs. The first one came from Colorado. It had some corrosion issues but mainly the choke valve was fused in the hole. I soaked it with some Silicone lube for a while and it came right out. When I went to the disassembly I realized the butterfly shaft didn't want to move. I told you that I typically don't take the butterfly shaft or the slide actuator arm out but in this case I had no choice if I wanted to save this carb. When removing these assemblies, the butterfly is the first thing to remove but even it was fused in the shaft and I destroyed it getting it out. I was able to get these assemblies out and clean up the two shafts to where they rotated as they are supposed to BUT now I didn't have a butterfly to put back in from an ES but I did have a butterfly from an SX. I went ahead and rebuilt the carb with the SX configuration and thought I would use one of the others for the reassembly demonstration.... HA!!!!!!!! I'll get to those in the next post. Here is the Colorado carb before and after. I'm hoping it will run just fine but we'll see tomorrow.
In the pictures you will see the difference between the ES and SX butterfly. This is the one and only difference between the ES and SX carbs. The hole and the metal treatment. I really don't know what that hole does. Do you? They are both made of aluminum and are exactly the same shape and dimension.
I also inserted a pic of the main nozzle in post #15. One thing I will say about the main nozzle. If your trike won't run right unless the choke is on, this is more than likely the culprip. A clogged up main nozzle. I run this through the bead blaster along with the needle jet holder. Over time these two parts will build a layer of film from fuel. The holes drilled in these two parts will actually grow smaller albeit not by much but it's enough to effect the way the carb works. Bead blasting ensures all the film is removed restoring these two parts back to their original condition. I'm convinced this is a large part of the problem with these carbs. When rebuilding these carbs, be sure these parts are as clean as you can possibly get them. The needle jet comes in the rebuild kit. Be sure you replace that every time as they are matched to the new needle. This is very important!!!!!!