We installed a Faco windshield, and it is extremely stable and tall. Maybe too tall. We have the Puig shield that we are going to try next.
As far as the rev limiter, that has been a problem in terms of tuning. With the Malossi variator and 13 gram rollers, the bike had great acceleration, but lost a bit off the top. We contacted Kymco about ways around the rev limiter, and it appears there is no simple solution. So, despite my reservations, we are trying a set of 15 gm. Dr. Pulley sliders in the Malossi variator. At the same time, we installed a CIF bell and the new Malossi Clutch and Contra Spring. There is a definite ringing sound at take off, but no shudder or lag. We haven't had a good chance to see what sort of top end the new sliders brought us, but the big Faco shield seems to have cost a bit off the top as well.