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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.
 

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You're testing me now Johno! I haven't owned one of these for many years..

From memory the three red lights are for the sidestand down (which should fold up automatically unless it has been modified), the oil pressure warning light (which should extinguish as soon as the engine starts) and the alternator low-charge warning. It too should go out once the engine is running.

Best I can do without one here I'm afraid..
 
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