Kawasaki 750cc, square 4

[Seeker]

Another bike that never made it...
https://www.rideapart.com/features/495297/kawasaki-square-four-750-project/

[Sir Trev]

Nostalgic look to it.

[Craig380]

Shame, isn't it, like Yamaha's GL750. However, Yamaha were able to adapt the GL motor as the basis for the TZ750 ...