Topic: CB500 Carb O-rings Kit- where do they go?

[DurangoCB]

Sorry to have to post this, since I know it's been covered before.  In fact, I see what is probably the info I need on the SOHC/4 site, but I don't own calipers, so when someone describes one o-ring as "1.3mm cross section" and another as "1.5mm cross section" it's not helping me.  The o-rings I'm pulling off my jets, bowl drain screws, float valve seat are too worn to recognize really.

My bike came with 4 Top Cover Gaskets and 4 O-ring Seal Kits, shown in the photo. 

I assume the 2 largest O-rings are for the T at each of the two 5mm fuel lines that run down from the petcock.  There are 8 total in the kit. 

Then there are two fatter o-rings.  They go where?

Then one that is slightly narrower than the two above, but with slightly larger ID.  Goes?

Then one itty-bitty o-ring.  Goes? 

And while we're at it, two more questions related to this carb cleaning:

1.  Does the Top Cover Gasket require any liquid gasket?  There was clear silicone used on the float bowl "o-ring" and the top cover gaskets when I pulled these carbs apart. 

2.  Carb #1 was beautiful... the other 3 were not pretty.  (See photo in my Project thread.)  It was clear that on at least one of the carbs, someone had desperately tried to correct for the awful state of the carb by driving the air screw all the way in.  What is the stock recommended air screw setting to start with?  One full turn out?  EDIT: Found the info.  1 Turn +/- 1/8 turn

[Deltarider]

The smallest is for around the main jet. It should seal well! If not, the cylinder will happily suck in the extra gas that will pass.
Then there's one for around the float valve.
Then there's one for around the drain screw,
Then there are two identical for one side of the T-joint, only to be renewed when they leak. Mine after over 40 years and after many harassments of my part do still seal well which saves me from the tedious task to separate the carbs from the rack which should only be done when REALLY needed! Don't fix what isn't broken! In my 40 year experience, I had only to renew the mainjet O-rings.

[DurangoCB]

The smallest is for around the main jet. It should seal well! If not the cylinder will happily suck in the extra gas that can pass.
Then there's one for around the float valve.
Then there's one for around the drain screw,
Then there are two identical for one side of the T-joint, only to renewed when they leak. Mine after over 40 years and after many harassments of my part still seal well which saves me from the tedious task to separate the carbs from the rack which should only be done when REALLY needed! Don't fix what isn't broken!

Thanks! 
My t-joint seals are in great shape, too.  Even though the rest were shot. 
Unfortunately, I was forced to take my carbs off the rack because the fuel lines between the carbs were cracked.  It wasn't too hard to separate them. 

[dave500]

put the top gasket on dry.