[Richard230]

Here is an interesting paper comparison of the old vs the new 900cc Kawasakis.  While a lot of technical advances have been made over the years, to me the bikes seem reasonable similar.  Although I might feel differently if I rode the new Z900 and then the old Z1:  http://www.motorcycle.com/manufacturer/kawasaki/1972-kawasaki-z1-900-vs-2018-z900-rs-spec-chart-shootout.html