If it's a black chin fairing... 240 on a DA sander, then 320, 400, 3M Rubbing compound, then 3M Finesse it, then wax:UP:
Haha.
http://www.buellxb.com/forum/showthread.php?51500-Buell-plastic-scratch-removal
Haha.
http://www.buellxb.com/forum/showthread.php?51500-Buell-plastic-scratch-removal