I had the 600 version of that Kawasaki Ninja in about 1987. Had a heap of other bikes over the years. Currently got 2 old RZ500 Yamahas in the shed waiting restoration. I used to ride one everywhere and I picked up another for parts.
I've also been messing with Yamaha XS650s. I built this one out of a collection of different parts a few years back.
I also customized a Yamaha Roadstar 1600. Made my own pipes and a bunch of other parts. Sold it to finance the Cobra build. (Excuse the white legs)
Cheers