This is a real raw, "get it close" method.
Disconnect the linkage between the carbs.
Turn in the idle and air by-pass screws all the way.
Back out the idle screw 1 1/2 to 2 turns.
Start the motor and get an idle rpm speed of 1k.
Using the sync tool to check the flow of each hole. Note which one draws the most. Call that
baseline.
Adjust the airflow to the
baseline cylinder's CFM by backing out the air bypass screw on each of the lower pulling ones.
As the idle creeps up, keep it down to 1k by adjusting the idle speed screws on the shafts the linkage attaches too.
Blip the throttle between adjustments to "clear" the carbs. Go around and adust the remaining barrels to the
baseline cylinder.
Tighten up the jam nuts on the air by-pass screws and reconnect the linkage. If the idle speed increases when the linkage is clipped on, it needs to be adjusted so it is
not binding.
Now double check that
all cylinders are pulling
the same CFM at idle. If not, keep trying, if so, drive it!
Hope that helps.
KT