400/4 carb balancing

[liberamor]

hi everyone and sorry for my troubled english.
I have a yellow CB400F, i bought from a collegue in 2013. i have to say that this Honda  has neve goes well.
now i'm trying again to start the project (yes, my project is to have just a little ride).
ok.  I cleaned carburator, adjusted the contact but, when i try to balance the carbs, i have the fourth stuck instrument as in this video.
https://www.youtube.com/watch?v=r82bqi1UUFE&feature=youtu.be

The carbs component they are all original, i changed the oring only. which are the cause i can check to resolve this issue??

Thanks and really sorry for  my english
Gianni

[Bryanj]

You need to check the rubber manifolds to head and somewhere there is my write up on bench syncing carbs

[mattsz]

...somewhere there is my write up on bench syncing carbs

This one from the "Tips & Tricks" section,  Bryan?

http://www.sohc.co.uk/index.php/topic,17769.0.html

[Bryanj]

That would be the one, i write em then forget where i put em!