hi. yesterday i pulled my carbs out for a bench sync before doing the actual manometer sync. this is what i observed while syncing them.
balance screw "c" changes only the #4 carb.
balance screw "a" changes only the #1 carb.
balance screw "b" changes only the #2 carb.
but i have read and seen many posts which mentioned that the balance screw in the middle ( "b" ) changes both #1 & #2. so that's why it's used to balance the carb as pairs ( #1+#2 to #3+#4 ). so i double checked it again but i could see that it changed only the #2 carb. has anyone tried it and noticed this ? if balance screw "b" changes the #2 carb only, how can we use that screw to balance carbs as pairs ( #1+#2 to #3+#4 ). please share your experience and give some advice. thank you.