If you can hear your Mikuni carbs "rattling" evidently you have changed the air box on your bike. The stock air box does two things, filter the air going into your engine and quieten intake noise. If you've changed or modified your air box in order to get better performance, you'll have to learn to live with more intake noise. The "rattle" you hear is really not a rattle. It is the "intake pulse" of each piston sucking air into the cylinder. Even at idle speeds, it does this so fast at to make it sound like a rattle. At higher speeds, it's so fast that you can't hear it most of the time. If the bike is idling at 1000 RPM, envision the piston moving up and down in the cylinder 1000 times a minute or 16 times a second. Every other time is an intake stroke, 8 times a second.
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