Yamato engine block & head on a Kawasaki JetSki crankcase?

[25xs]

This looks interesting... Any idea if Yamato made this or did someone adapt it to Kawasaki application?
https://www.ebay.com/itm/254485675157

[Mike Ward]

This looks interesting... Any idea if Yamato made this or did someone adapt it to Kawasaki application?
https://www.ebay.com/itm/254485675157

From the late 1980s to the early 1990s, Yamato developed a Kawasaki Jetski race cylinder for the aftermarket.
They sold about 50 units to a certain Japanese vendor - this is probably it's one of them.