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These are not a great cause for concern.
There is a hose - about 1/2" diameter, that allows air to come and go above the carburettor diaphragms. There should be one emerging from each carburettor, attached to a gold-passivated elbow, if you still have the standard Mikuni CVs.
The non-carb end of these hoses should have a 'slash cut', and be poked into the little plastic box. It is just to discourage dust and dirt from being drawn into the vacuum chamber above the slide diaphragm.
If your bike has the Keihin FCRs (probably unlikely on a 400) these boxes are unnecessary.
There is a hose - about 1/2" diameter, that allows air to come and go above the carburettor diaphragms. There should be one emerging from each carburettor, attached to a gold-passivated elbow, if you still have the standard Mikuni CVs.
The non-carb end of these hoses should have a 'slash cut', and be poked into the little plastic box. It is just to discourage dust and dirt from being drawn into the vacuum chamber above the slide diaphragm.
If your bike has the Keihin FCRs (probably unlikely on a 400) these boxes are unnecessary.