Like to pass on some info on Windhields for SilverWing 600.
Over the past 60 years and over 1.5 million 2 wheel ,miles and lots of money wasted
Baseline for performance:
Heinrich upper and lowers BMW---Had on both plunger and earls fork, later set on tele fork R60/6=Perfect air/water/cold control----worked well with open face helmet even at German speeds
Scooter: Vespa PX200E with shield I think made by National Cycle. Perfect, secret: nose close to tip of shield.
HD--Old Winter windshield kit on standard windshield, tin legshields---pushed lots of air, kept you dry and warm in winter, sucked dirt on your back. But comfortable ride down the road.
NOW maxi-scooters. had 9 new ones since 1990. Standard shields all did not work well. Have bought and used replacement Puig,Clearview, Cee Baily, Givi (have tried both adjustable and fixed) Almost impossible for look over shield to work on maxi scooter-----YOUR NOSE IS TOO FAR FROM TIP OF SHIELD! Design flaw
MY finding for SilverWing.....only GIVI Adjustable works approaching well----shoulders still get a little air, little hand protection in hard rain and buffeting well controlled (foam ear plugs keep noise down).
I ride by choice in all weathers/long distances/ don't like to be beaten up by air and frozen in winter.
Reason GIVI adjustable works: I think-- air routed overhead by 2 piece design, sliding adjustment. I leave mine in low position as it works well there and no goofy head/neck positions required to see over.
Hopes this helps in making windshield decisions.