When looking over an oil leak I also went ahead and synced the carbs since its easy when everything is exposed.
For syncing the carbs I went penny tech with a wooden board and a hose with some engine oil in it, a more brightly colored oil makes it easier to view the levels but engine oil I had nearby and works just fine.
The hoses connected to the intake are on the bike at all times but plugged (plugs are actually from a book shelf pins that are used to hold the shelfs in place):
And here is what it looks like:
The adjustment screw is on the left side inside the air box near the rear carb it adjusts the linkage between the two carburetors.