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All TB's are tied into the aluminum tube that is centered between the
TB's. They are the 3/8" black tubes that come out of the TB's. I tried jetting them etc etc, but now they are open to the plenum. I needed vacumn for the Columbia. I have a seperate line running to another tank for the
Columbia. If you get out of the city limits with a flatty, the Columbia makes it nice for cruising.
Dick in Havasu