Join Date: May 2007
Location: Maine's north woods
How I fixed my buffeting without changing windshields.
Total cost: $3.50 in stainless hardware, plus $69 for a tank bag...
So I'd noticed that a lot of buffeting seems to be from a turbulent updraft coming off the tank. It starts at the knees, goes straight up along the torso, and when the airstreams from either side of the bike meet in the middle, they shake my torso and head quite a bit. Push your knees out and the buffeting gets much worse. Squeeze the tank with your knees and it smooths some.
And I also noticed that at 6' tall and the shield in the middle position, that the transition from "still" air to moving air was at about forehead level. The top position left me in quieter air, but my head would get jackhammered.
So I moved the screen to the secret "fourth" position, using a couple stainless 6mm x 1.0 cap screws and a couple stainless washers because the "top" windshield bracket bolts won't fit in the lower holes. This position creates a large gap at the bottom of the windshield so a lot of air goes under the screen and shoots straight up. That gets my head in quiet air without ducking, but there is still turbulence.
...And then I took a ride with my tank bag on. For some reason that smooths the updraft and now the buffeting is nearly gone, even up to 90 indicated...
For now, I'm happy. I don't get a headache riding on the interstate anymore and I can drop two clicks on my earplug volume now that my head is in the still air behind the shield. The "vision line" over the top of the shield is probably 30'-50' ahead of the bike, which is fine.