I lowered my Givi windscreen by heating it along the hand crease and bending it back. The noise is much better as the air strikes lower now at the collar bone. It is still the perfect height to give a good wet weather crouch, leaning forward with your line of sight just over the edge where the turbulence over the top of the screen acts as a blow drier to blast water drops straight down so I never even have to wipe my face shield until I get into slower boulevard travel. It didn't make much improvement to the fuel economy even though it looks more aero now and I never had a chance to do any timed runs before moving on to installing the slider style variator weights. It took a surprising amount of heat. That polycarbonate is rugged! It took one heat gun in each hand to get it hot enough to move. Take some masking tape and pull the shield back partway to hold it while you apply the heat all along the handguards and crease. Measure before and after with a tape measure as shown. I moved mine down and back 2.5 inches in two stages. That is as low as you can go as the mirrors become a problem at that point. I ended up doing some additional trimming at the top two corners with an 1/8 inch router bit in my dremmel tool. Very easy and no chance of cracking. Play it careful from line as the blade can chatter wide on you. It is easy to sand another 1mm with a sanding block to get the final shape. It's quieter, better in the rain, and the hand protection moves out a little wider.
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