Whitey knows about a thousand times more about mechanics than me, but to refresh his memory about one detail I remembered seeing this below at Wikipedia. The 2000 to 2002 ZX-6R has the same engine and frame as the 2005 to 2008 ZZR600, but with no birdcage holding up the front fairing starting in 2005:
"In 2000, the first J series replaced the G, increasing power to 112 bhp by increasing the compression ratio from 11.8:1 to 12.8:1. The J series sported a couple of modernisations including a 180 section rear tire, second headlight, and uprated generator and stick coils (coil on plug) replacing the traditional coil with HT lead."
“We need randomness, mess, adventures, uncertainty, self-discovery, near-traumatic episodes, all those things that make life worth living; compared to the structured, fake, and ineffective life of an empty-suit corporate leader with a preset schedule.” From Dr Nassim Nicholas Taleb, Antifragile: Things That Gain from Disorder