I noticed that Maier makes plastic skids for the 90. I have these on other bikes, and they are light and tough. If any bike ever needed a skid, it is the 90! It has virtually no engine protection. Plus, it is also a good idea to protect the frame rails from damage. And, these bikes are ridden by the least experienced, roughest riders. Cheap insurance!!

http://www.maier-mfg.com/