So, it finally happened.
I finally got time, no, finally made time to put hands to the carbs. A quick refresher, the carbs were cleaned and rebuilt but suffered severe leaks at the fuel T. I replaced those o-rings and then the bowls leaked. With new bowl gaskets in, I decided to just bite the bullet and replace the remaining 33 year old o-rings for the fuel overflow and the mystery silver tubes (vacuum?) while I had the carbs off again. This was all late last summer.
With the family having quiet time, I seized the moment and grabbed the the carbs and needed tools. I've never broken a part a bank of 4 carbs and I have heard horror stories and seen first hand, the frustration this can cause when my buddy rebuilt his CB750 bank. I laid out some cardboard, took a deep breath, found my moment of zen, and got to work.
There is so much linkage, so many tiny springs.
I removed the choke linkage and did my best to keep the two middle carbs in place. I was able to replace the o-rings on the mystery silver tube (vacuum related?) but the o-rings on the overflow port were still pliable and in relatively good condition.
When I replaced the o-rings on the fuel T, I bent one of the tiny throttle assembly springs, so I had to do my best to replace it with one from a set of donor carbs I received. It wasn't much fun.
I got the bank all back together and thought, "That wasn't so bad." Queue suspenseful music... I found a spring that got left over. Dammit. Eventually, everything was reassembled with no extra parts remaining.
A friend recommended placing the carbs output side down on a sheet of glass and using the level surface when tightening down the mounts. Worked liked a charm!
Now, to put them back on the PVC rack and hook up the test tank to check for leaks. Maybe that will happen next weekend.