Copper pipe? That's odd. Top of carbs would be plastic & retain the diaphragms. I've seen the plastic pipe off them break before. Or was it near the top. Post a pic, I'd be tempted to just throw a wad of Kneedit over the hole as a temp fix if it obviously runs better that way.
so what did this pipe connect to? The Vacuum gauge pipes usually have a plastic cover over them available at Supercheap in those multipack boxes for bolts & pannel fittings. If this is what it was then you wouldn't be able to syncronise the carbs, if indeed you cared. But a careful drill into the carb & insert a new pipe with some epoxy would fix it, but of course you'd want to pull out the diaphragm & collect the swarf.
High consumption is another issue, may be related, may not. Old carbs like Mikuni CVs of that era wear the emulsion tube oval, that can cause bad ecconomy, but comparing it to a modern kawi twin is unfair. How many kph are you doing? (price of gas is so variable). Probably shouldn't expect more than 16-17 out of an old bike.
Don't you look at my accountant.
He's the only one I've got.
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