Yup- ask Carelesschucka about that, if it's not blocked you get a vacuum leak and the carbs stop working properly. Basically, to balance the carbs you measure the relative strength of the vacuum at each carb, and adjust them till they're the same. Without that wee hose, it's a sod to do as you need to attach the hose to an inaccessible nipple (fnarr) on the front of the carb. But you can leave a line in place like this, and just uncork it and attach the gauges when you want to. Makes it miles easier.
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