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Hmmm... how does Polini make the manifold fit both the 28/30 mm carbs? Answer is that they compromise. Measuring the inlet of the manifold reveals an inside diameter of 28.4mm. In comparison the outlet of a Mikuni 30mm was measured at 29.8mm. So if you look down the barrel of a Mikuni 30mm connected to a 28/30mm Polini, you will see a lip all the way around. This is not desirable and some machining to match these up may be required.
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