We've already featured two Kawasaki ER-6 GNC racers in Sideburn (theIndy and Springfield-winning Werner Springsteen Ninja in SB7 and Johnny Lewis's Scott Motorsports in SB9).
The blue bike is the Baer Racing Kawasaki. Not sure about the 1990s custom wheels on one of the bikes, though. I'd stick to the PMs.
There are lots of different ways to skin the Kwak cat. G
All the photos except the silver one are from Poppawheelie.