Soooo... Ya'really screwed it up did'ya?
Make sure that the measurement of the threaded cam rod is exactly as the graphic below.
Now.... Temporarily back the throttle roller away from the cam so that it has no effect on the carburetors.
With the carburetor face plate removed so you can view the throttle butterflies if needed... adjust the linkages between the three carburetor butterflies so that they "all" start to move (and stop) at the same time. You do not want a butterfly closed and one (or more) held open ever so slightly at idle.... Also, make sure that at full throttle (engine NOT running), that the butterflies are wide open (Horizontal).
Now... adjust the throttle roller so that the throttle butterflies just start to open when the scribe mark of the metal cam is dead center of the throttle roller... not before or after.
The throttle roller!..... For many years the roller was just one piece (3/8" dia) and served us well. Then some engineer in all his brilliance decided to design a two piece roller.... a smaller black roller (approx 1/8") with a clear plastic or nylon covering over it to bring it up to its original 3/8 diameter. The clear covering is worthless, cracks, breaks, falls off, with the resulting smaller roller now throwing the engine completely out of synchronization.
Should you, or anyone reading this reply, encounter a redesigned roller that this genius came up with, that is faulty... replace it with a proper sized 3/8" diameter roller before touching any of this type linkage!
That should do it.
