I've had a mid sized sport windshield on my 94 since the first few days I had it, 4 years now. With the original forks in good shape and air in them, I had the bike to 130 and had no wobble. When the forks started leaking the low speed wobble intensified drastically. Uneven fluid levels, I'd imagine.
I recently changed the front forks out with some that Sean had rebuilt from a 97. Springs, Gold Emulators and BG Fluid. After doing that, I had a moderate low speed wobble, even at 10 mph with one hand off the bars. The wobble was there at most speeds to 55 when using one hand on the bars. We adjusted the steering bearings at the last tech day that CaptainKyle had at his house, here in Fl..
After that adjustment, I noticed a weave at certain speeds and with a certain load. I backed the adjustment off about 1/16 of a turn and that cleared up. It only slightly shows up with both hands off the bars.
I had the bike to 120 mph the other day and no hint of wobble. I dropped the throttle at the peak and it was still steady. I believe the windshield helps to keep the front end stable by placing an increasing down force on the front forks with increased speed. Kind of like a spoiler. I've run this type of windshield on other bikes to nearly 150 mph and they were rock solid as long as the windshield is 4 point mounted.
Just my thoughts.
I've heard so many cures for the high speed wobble that it's really muddied the issue. Everything from rear tire pressure, Front tire design, wheel design of the stock VMax wheels, shocks, springs, bearing tension and on and on and on. There may not be 1 set cure for every VMax, just gotta find out what cures the one you ride.:biglaugh:
Note, I started using this type of windshield because I was hit in the chest by a moderate sized bird that got into my flight path. It was on an XJ-1100 Yamaha. I was accelerating hard, at about 80 mph when the bird hit me. I nearly went off the back of the bike. The sissy bar stopped me in time to regain my composure and a death grip on the bars.