I generated this procedure for a Solex customer of mine:
1. Disconnect drop links connecting the throttle crossbar (lateral, tubular rod connecting throttle linkage to both banks of Solexes) from the layshafts that control both banks of carbs. "Layshaft" is the tubular shaft that that located alongside the left side of each set of the three banks of throttle bodies. It is supported on each end by ball studs mounted in angle brackets that are attached to the manifold.
2. Disconnect all three turnbuckles from the layshaft and check that there is no axial play in the layshaft. Axial play is defined as looseness in the quality of the support of the layshaft in the fore and aft direction. It is easy to remove axial looseness by inserting washers between the angle bracket and the ball stud supporting the forward end of the layshaft. It is also possible to bend the rear angle bracket using a brass drift and a hammer, this sounds like caveman style but sometimes, an adequate amount of shim washers in the threaded ball stud mount will not allow complete removal of axial play. Be sure to check for freedom of rotation of the layshaft after adjusting for axial play and re-adjust until both axial play and freedom of rotation is achieved.
3. Adjust tip of idle speed stop screw to extend from the layshaft by about 1/8 inch. "Stop screw" is the screw with concentric spring that is installed in layshaft.
4. Connect turnbuckle for cylinder #1 connecting layshaft to throttle lever arm on throttle body #1.
5. Adjust turnbuckle on cylinder #1 until the throttle plate is closed. This is determined when the tip of idle speed stop screw just lifts off the steel disc pressed into the manifold. (You can use a piece of paper between tip of stop screw and manifold disc to help determine when screw lifts off of disc.)
6. Connect turnbuckle for #2 and repeat the adjustment procedure checking for "lift off" of the idle speed stop screw from the steel disc.
7. Repeat for turnbuckle #3.
8. Repeat from Step 2 for cylinders #4 through #6
9. Finally, turn both idle speed stop screws 1 full turn (CW). This opens the throttle valves from fully closed to allow air for initial idling operation after startup.
10. Remove air cleaner and open throttle for cylinders 1, 2 and 3 to wide open and look down throat of carb #1. The throttle valve should be vertical. If the throttle valve is not vertical then adjust the stop screw that controls its position until it is vertical. The stop screw is installed vertically in the manifold and has a knurled head where the layshaft contacts it. It is locked in place with a 10mm hex nut under the manifold casting where the stop screw is installed.
11. Repeat Steps 9 and 10 for cylinders 4, 5 and 6.
12. Adjust mixture screws to be ¾ turn open (CCW) from fully closed. Mixture screws are the knurled head, brass screws with concentric springs. Be gentle when closing these screws (CW) since they are made of brass and will easily ridge the tapered tip of the screw.
13. Connect drop link from throttle crossbar to the ball stud on the layshaft controlling the 1,2,3 bank of carbs.
14. Adjust length of drop link from throttle crossbar to just slip over the ball stud on the layshaft controlling the 4,5,6 bank of carbs
15. This completes preparation for starting from the carburetor linkage point of view
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