A simple way to synch carbs.
Back off the idle stop adjustment screws so they are not in contact with the linkage, where you can put a feeler gauge in both and measure the same clearance without moving the idle stop levers.
Adjust the screw that connects the pirmary linkage (fixed) to the secondary linkage (adjustable), so you get the same measurement at both idle stop screws. This measurement will be greater that your initial measurement but should be exactly the same from one to the other carb. Add feeler gauge leaves until you get both sides identical.
regards
mech
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