EXUP Worldwide was born from the ashes of the original EXUP Brotherhood – the definitive forum for all those who have interest in Yamaha FZ, FZR, and YZF motorcycles.
There's an interesting column in Cycle News Issue #45 (Nov 15, 2006). It's the Archives column by Larry Lawrence. titled Yamaha Discovers Supersport. It's about the entry by Yamaha into the AMA Supersport class with the FZR600 and how they dominated the class in 1989.