The vacuum line is attached to the petcock. The fuel supply line is attached too. The rubber tubes coming out of the back of the carbs don't hook...
Yes, I did all of this: remove jets mixture needles carb diaphrams emulsion tubes fuel needle , seats and floats clean everything real good...
So I tore down my '85 XJ700 to get it to run better. New plugs, air filter and carb rebuild kits were added. Now, all i get is some sputtering...