Carburator throttle tension springs.

[Aurel]

Hello everyone, I have been using the forum for a few months now, even tho I never posted i have been learning a lot about my first motorcycle, 85 gl1200 interstate. I purchased it on an impulse, made a big mistake moneywise and have been fixing it since then, ive done a lot(front fork seals, carbs, manifold gaskets, unstucking valve shifter, replacing brake lines, rebuilt all master cylinders, oil change, air filter...) i still have quite a lot to do but I will get there, eventually.

The first time I did the carb I just cleaned the inside, checked and adjusted floats levels) I noticed a large amount of play on the syncing screw see video :
youtube.com/shorts/jXCvVMiORIw

I recently noticed I was running on 3 cylinder when I tried to sync the carbs while idle, I checked compression and all was between 170-180.
I switched spark plugs, ignition wires, always the same cylinder showing 0 on the carb synchronization tool (also switch hose to make sure it wasn't the tool)

So I decided to redo the carbs, properly this time, I bought an ultrasonic cleaner, because as you can see in the video from after my previous rebuild, the outside was extremely dirty)

I helped myself as much as I could from a conversation from virgilmobil and someone rebuilding an 84gl1200. That help a lot. I finished cleaning it yesterday, it took me about 4 days and it is now super clean, used air compressor, changed all O rings on hard tubes, I believe this time I did a pretty good job. I was about to put it back on the carb but before that, I wanted to bench sync them and add some gas into it to make sure there's no leak(as virginmobil mentioned on the post)
To my big surprise when syncing the carbs, one side would not sync, one throttle stays a little but open and the other one is closed. I noticed the play is still there, a little bit less than before but still.

I removed the problematic carb of the plenum and started to dismantle it

There is still play between where my 3rd and 2nd finger, if I hold the part on my 3rd finger and open the throttle, there is play before the throttle starts to move.

I was thinking maybe the spring tension is off, and also wondering how to dismantle further to check inside the linkage. If anyone has information on how to proceed, or have any idea of whats going on, please let me know.
I know for a fact this carburator has been worked on before, and not well at all, so maybe mistake were made, mistake I need to find and correct!

Thank you for reading all this, I know it is a big post and English isn't my first language, I hope it wasn't too painful to read, if it was I apologize!

[Aurel]

I also just noticed the play dissappear when the adjustment screw is screwed in almost all the way, but then am I going to be able to sync the carbs if I cannot change the settings on it?

[Aurel]

Well, ended up spending the day researching a picture of the same throttle shaft, realised my shaft has been tampered with, plate and plate housing was bent and almost impossible to remove the butterfly plate, had to use soft plastic hammer and it took me about an hour.
I'll get a new carburator when I can afford it, for now I used a press to get the butterfly straight, and softly grinded up one side enough so I could put it back in the bent shaft without damaging the plate further, It's better than what it was..

Shame on me for buying the worst 24k miles goldwing of Texas.
Probably not even accurate odometer at this point

Admin can delete thread since it's of no help to anyone!

[Bike...and Dennis]

Sometime it is a little difficult to follow these threads, but I tried. You'll need to buy a new bank of carbs and start over, with some real step by step help. Main thing is to get OEM parts and a real cleaning system.
And it's probably 124K miles on that bike.