[travellingtenor]

Originally Posted by SLOWn60

Just because I don't know the facts; it won't stop me from having an opinion!

I guarantee its to stop buffeting behind the windscreen by eliminating a low pressure area. By venting, smoother, laminar airflow is created which would be perceived by the rider as a smoother ride experience.

Winner Winner Chicken Dinner! That's exactly why there is a gap. Air will rush into a low pressure area and cause buffeting. Allowing air into the low pressure area evens out the pressure to neutral and provides a better airflow.