Airbox reservoir?

irk miller

You've been mostly-dead all day.
It's a breather separator. Basically, it's a rudimentary pcv system. Sort of a catch can. They put them on lots of bikes back when the the emissions regs hit in the 70s. CB750's also ran them with one hose going to the air box, one hose to the valve cover, and a third as a drain which could go to the ground or back into the crankcase.

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