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Next, the secondary carbs are checked using the syncing tool. Both carbs required adjustment on the idle-speed screw, which bumped the idle rpm of the engine up slightly. By going back and forth between the primary carb and secondary units, small adjustments were made until all three carbs measured the same vacuum via the Uni-Syn gauge (synced) and the engine idled at a proper rpm rating. At this time, the primary linkage between the throttle pedal and primary carb can be attached.