Use a long pvc pipe and "listen" to each of your carbs (filter 
removed). Ideally you are looking for a similar pitch from each carb 
adjusting each carb's idle mixture screw.  It 
does work; I use it on my KG Kadron dual carbs.

 This advice was passed on 
to me by a mechanic who worked on MG's for years...
It IS cheaper than  buying  a  unisyn - DC
 On Thu, 7 Jul 1994, tim c. brim wrote:

> OK, I've been reading this thread for about a month now.  What I've read
> has helped me in a lot of my troubleshooting problems with my '72/'73 bus.
> I've also noticed that you all really like to bash mechanics, which they most
> definitly deserve.  I however have a simple problem.
> 
> The problem is that:
> 1.)  I hate to give a grease monkey any more money to work on my bus.
> 2.)  I don't know of any efficient way to sychronize the carbs.
> 
> My question lies therein.  Is there any way that I can sychronize the carbs
> myself?  I've read the Bentley and it's very explicit about how you should
> "take it to an authorized VW mechanic" to have this done.  It then gives this
> lenthy definition of how to adjust the carbs.
> 
> Problem:
> 3.)  Bentley says you need a CO tester.
> 
> Without going out and buying a couple thousand dollar Sun measurement machine
> is there a way to test the CO level?
> 
> I know this probably a hopeless case but I'm just hoping that the Bentley
> manual is wrong.  Well, just this once.
> 
> 
> ================================================================================
> T. C. Brim                                 Can you say "Road Trip"
> ================================================================================
> ~
>