Recently split and serviced my 900SS Ducati downdraft Mikuni's....performed a bench synch...visual method using certain reference points...exact same method I routinely employ within my carb service.
Upon completion I verified synch using my pro mercury manometer....untouched results (see pic) ...NO further adjustment needed.
IMHO bench synch is quite accurate...provided correctly, precisely done. Proof is in the puddin', as they say.
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An aside...to address homemade manometers sucking liquids...pro devices use tiny restrictors in each hose....much like pilot jets.
Suggestion...perhaps experiment a bit using equal sized main or pilot jets inserted into each hose?
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