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83 cb750sc not revving under load

ruffryda9681

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Rebuilt carbs and runs fine on idle but will not even under load. Both vacuum ports on carburetors have been plugged. Do I need a vacuum signal to one of those ports and if so where does it come from? Thanls
 
There is only one port on the #2 carb that runs to the vacuum valve on back of carb bank. The other is a vent. Many remove that valve entirely to run fuel line directly tank to carbs and then no need of it but you have to turn gas off when you stop bike at end of ride. A good skill to learn anyway.
 
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