DIY Carb. Synchronizer

[Bob_Roller]

I don't know if this will be helpful or not, but when I set the idle adjustment screw to one half turn, I put put the thinnest feeler gauge between the screw and throttle arm then adjust the screw until grabs the feeler gauge .
Gives a bit better starting point than than eyeballing it .

[Barry]

My first question is whether anyone thinks it's worth carrying on trying to balance the carbs considering the difference in cylinder compression?My second question is by turning the idle mixture screw in, should this basically increase or decrease the vaccum on that side?

It has to be worth trying a synch if you intend to ride the bike before getting around to sorting the compression problem but don'r expect perfection. I would be inclined to check your results with the "shorting method" given the discrepancy in compression figures.

Changes to the idle mixture don't really show up on a vacuum balance. You can have perfect vacuum balance at idle with quite different idle mixtures on each cylinder. Again shorting one cylinder at a time will show that up quite readily.

[Tony Smith]

I seen some balancers using bottles but a simple U tube manometer filled with ATF seems less messy.

Water with food dye even less so.