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if you open the throttle quickly to say 1/3 to 1/2 way they open imediately,

That should never happen. Check to make sure you do not have the six pack vacuum hose to the center carb switched with the one for the vacuum advance. The two ports are very close to each other. The port that comes out of the main body is the one you want. The port on the side of the metering block is for vacuum advance. The correct one is rearward of the other. Do you have a pic of the right side showing the hoses?

Last edited by GomangoCuda; 12/23/21 02:37 PM.
In theory, there is no difference between theory and practice. In practice, there is.