I have a Unisyn that I used in my bike shop set it mid range on one
and then see if the other cylinder matches it ....
they demand alot of area behind the carbs though and I've heard they're not very accurate .... that is why I made up the synchronizer and it IS indeed more accurate than a Unisyn !.... besides the fact most bikes have vacuum ports now for synchronizing.... that was not the case way back in time !
and with a Unisyn you don't need vacuum ports !
just press it to the back of the carb !
....
I heard that the mercury filled synchronizers can have the mercury sucked into the engine.... is that true ?......forget you have it hooked up and goose it and it's all over ! .....
that would totally suck !
....
Bob.....