sync question

[oldyam80sg]

i replaced the vacuum line from advancer unit to #2 carb body be cause old vacuum line had a crack in it.How come i hear a noise coming from advancer unit now?Bike idles fine,i have not been able to sync carbs yet(very sick).Took it for a 2 mile ride-seems that bike is getting too much fuel.When i rode it around a parking lot it seemed fine.Now it seems like bike wants to stall and when the bike is warmed up,after you shut it off -does not want to start without choke.Please help!Could the carb sync really affect it this much?Does anyone make a gauge?

[petejw]

to check the vac advance 4 leaks,
suck on the tube and watch the unit
rise, hold ur tongue over the hose, the unit
should hold the vacuum if not the unit is buggered.
carb synch is really important 4 a smooth running engine,
especially if uve had ur carbs apart.
check your spark plugs black and sooty shes running to rich.