Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
One thing I noticed is a reference to a slow jet. There is'nt one on the parts diagram so presume it's a drilling. Must check that for size.
Just found the reference to a slow air jet - it's in an addendum to the CB550K manual, shows a fuel level of 14.5mm so must be a different version of these carbs.