This how I set up I'm using for balancing the carb. The Morgan tool is very easy to use, and I'm using the bikes fuel tank with an extended fule hose.
As you can see on the first picture, the carbs was out of balance. For synching the carbs, screw off the cover on top of carb #1,3 and 4. Carb #2 is the reference carb and it doesn't have an adjustment screw.
Loosen the lock nut and adjust with the slotted screw. And be patient. Locking the lock nut sometimes is enough to disturb the adjustment, so you often have to do it more than once. If the engine gets to hot, take a brake and let it cool down a bit.
The ultimate result is when all 4 carbs are equal. But that is often very hard to acchieve. A difference between the carbs that is less than 1 cm/hg is very good.
And here you can read the instruction for the Carbtune:
http://www.carbtune.com/inst.html
Balancing carbs with a Morgan Carb Tune
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