Ensuring the linkage is symmetrical....and I quote:
"The procedure I have outlined here all dual carburettors, even dual single bbls (except you only have one mixture screw per side, since one barrel feeds TWO cylinders). Other important things to check are that the linkage pieces "match" from side to side, and from carburettor to carburettor. The linkage has to keep the carburettors at the same adjustment at ALL throttle positions, not just idle! Part of this is that the carburettors have to open at the same rate, and if one side opens faster than the other, the car may run fine at idle, but hesitate and miss when on the road. Make sure the linkage is symmetrical. Also, you need the vertical throttle rods (If it's crossbar linkage) to be matched in their pitch from vertical. This ensures that the two carburettors open at the same rate, since the crossbar is rotating the same on both sides.
Sometimes you have to add/remove washers from various ball-joints on the linkage to adjust the threaded rods so they are at the same angle on both sides of the engine, but the engine will run SO much better, and it's amazing how many "experts" miss this important detail. "
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