Front fairing is replaced with aftermarket fairing.
Its height looks OK to protect wind.
Seat is also replaced with K&H single seat for YAMAHA SR400/SR500.
Those aftermarket fairing and single seat mach this black 1990 R100RS.
As compared with MOTOCO seat,K&H seat is not perfect.
Because it was developed for SR not for R100RS,
bottom line surrounding seat is floating slightly from seat frame.