They prevent the water that runs up the windshield from the bottom from blowing through the hole and hitting the rider.
The seal around the top of the windshield performs the same function. It is surprising how well that little seal redirects water.
Thanks for the info Chaps. I think I'll order a couple of new ones. my 'inherited' 98 ST1100 needs a bit of TLC, so looking forward to learning a lot from this site.
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