I had an old screen laying about so decided to attack it with a 10mm drill to see what happened all in the name of science.



Firstly my stats,
Standard seat, I'm 5'11" wear a conventional full face helmet (no peak), clear plastic headlight protector & I have some small spot lights fitted in the gap between the bottom of the headlight & grey indicator panel.

From what I can gather a lot of the buffeting is caused by the vacuum behind the screen & wind up through the fork tunnel. Looking at other tall screen bikes there is a vent in the lower part. So with that in mind the first holes I drilled were either side of the Yamaha logo near the top of the headlight cowling to direct some air up behind the screen. I also drilled some half way up, then in the sides.
Without the holes riding with the visor up with my lid, it would start to close itself at 95kph, with the holes it now stays up to a speed of 125kph. I can feel the wind hitting me lower down now across the shoulders rather than chin to face area. There is still a bit of wind rush around the head but doesn't seem so rough. Bit of a result there. But riding a motorcycle you are generally propelling yourself along faster then nature had intended so a slight discomfort is to be expected.
Previous to fitting the spotties I did also try filling in the gap under the headlight but felt the engine was running a bit hotter in this climate, so it didn't stay there for long even though it worked really well otherwise. Would be fine in colder country's I think.
Just a note on drilling the holes to, going straight in with the 10mm bit was better than a small pilot first, as the bigger drill bit would snatch more violently at the end following through the small previously drilled pilot hole.