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It's probably just syncing the carburetors. Usually, you're adjusting the openings of the butterfly valve on the throttle so that the engine is pulling the same vacuum through each cylinder. It's easier than it sounds, as long as there aren't any air leaks.
On a non CV carb, I'd imagine it's like adjusting the play in the throttle cables, if it's one cable per carb, or I could potentially see it being like adjusting the idle on a single cylinder piston valve carb, as generally multiple carbs don't have individual idle adjustment.
On my R80RT, you have to balance the carbs, and there's individual idle adjustment for each carb. It's a bit finicky, but not too hard to do if you're patient.
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