I always do and always have raised and lowered my windshield at high speeds. I have 153,000 on my current bike.

 

Need to grease windshield tracks. Then you'll be able to raise and lower while riding.

Force from wind pushing on windshield increases friction between tracks and motor. Overwhelming motor's ability to move windshield. I like to use silicone grease with squirt of dry graphite lock lube on top. As grease wears out in 10-yrs, graphite will have coated surfaces and continues to lubricate.

Some people like to change windshield brackets at this time to angle windshield flatter. This allows extra air to flow underneath between windshield and dash to reduce pressure-differential between both sides for less buffeting.

 

My Honda ST-1300 just needed a bunch of service, including some trouble with the electric motor powered windshield.
Now I took it out post-repair, and found on the highway that sometimes it didn't go up as high while cruising as it would go when sitting still at a traffic light.
I got on the ST Owners' Forum and found out that it's not recommended to try to raise the windscreen on the fly at any significant speed, out of fear you could burn up the motor or strip the plastic gears.
The Honda owner's manual doesn't say anything about this (I just re-checked it yesterday, and re-read the pages about the powered windshield).

For those of you into touring bikes with powered windshields or windscreens, do you have any restriction (official per MFG or just self-imposed out of an abundance of caution) about raising the shield while you're zipping along at 55+ MPH?

I raise and lower the windshields on my Victorys and Indians all the time at all sorts of speeds, never had an issue. I don't know of any limits in the manuals unless I missed it.

 

The top screen on my Triumph is manual adjust. So I need to be stopped. I put it up on sunny days as I am looking thru it. It is down on rainy days for the same reason. But I try to not ride Noddy on rainy days. So I must have it down on foggy mornings. E motors and gears and tracks, all add weight, which I am not very fond of.

 

I raise or lower the windshield on my R1150RT and my Spyder no matter what speed I'm going. No ill effects on the Beemer, still too soon to tell on the Spyder. If it starts raining while I'm riding, I'm glad I can simply raise the screen and keep on going.

 

My Honda ST-1300 just needed a bunch of service, including some trouble with the electric motor powered windshield.
Now I took it out post-repair, and found on the highway that sometimes it didn't go up as high while cruising as it would go when sitting still at a traffic light.
I got on the ST Owners' Forum and found out that it's not recommended to try to raise the windscreen on the fly at any significant speed, out of fear you could burn up the motor or strip the plastic gears.
The Honda owner's manual doesn't say anything about this (I just re-checked it yesterday, and re-read the pages about the powered windshield).

For those of you into touring bikes with powered windshields or windscreens, do you have any restriction (official per MFG or just self-imposed out of an abundance of caution) about raising the shield while you're zipping along at 55+ MPH?

Well, my stock windshield when all the way up (3.6” of travel infinite adjustment) was fine for protecting me but didn’t keep as much wind off the wife as I would like, so I custom ordered one from Clear View that was 2” taller and 4” wider than stock. When all the way down now I’m just looking over the top and through it only when viewing about 30ft or less in front of me. However, when it’s up & it’s raining I have much more protection and so does the passenger.
To answer your question, there is NO issue raising or lowering mine even at 90mph. It’s effortless and mine is also voice controlled so I don’t need to fumble with buttons.