When i bought my Wing an extra windshield was included. The spare has the vent in it. What are the pro's and con's of the vent. Hate to change it and find out that there was a good reason for not changing it.
+1 on Mark's comment. I learned something about mine last night when using the chamois, the vent is actually never closed completely, ther are louvers in the very top of the vent that allow a small amount of air movement when in the closed position. Reduces buffeting somewhat I reckon.
I leave the vent open just about a half inch all of the time. It really does help with the buffetting. Of course in warmer weather I have it open all the way. Conis it lets some rain and condensation blow back onto your face.