Jim, there is room for both designs, pending the ability of the modifier.
Myself, for a nice street engine, I'd 6 speed, dry clutch, liquid cool, case reed from the front, EFI, reverse the cylinders on the cases, lots of work. But, that is what I like to do, and have the ability to do, although I have no time to do it.
I also rode another street bike prototype in Japan, before coming to work for Kawasaki, triple, air cooled, dry clutch, 6 speed, dual rotary valves. The company closed before it got to build 'em, they had already built 350cc twin cylinder, air cooled, dry clutch, 6 speed street bikes, and their triple was a 550cc rotary valve design.....Bridgestone. thank Honda for closing the Bridgestone Motorcycles part of Bridgestone tires down and out.
Others don't think that would leave an H2.......an H2, and that is fine, to each, their own. Nice to "dream", that is usually where creative thought, and neat new mods come from.
Many do not know about one prototype that a bunch of us in Road Racing rode in the early summer of 1973 in Santa Ana, a street bike. It was "deemed" an H-3 street bike, 750cc, rotary valve square 4, 6 speed, liquid cooled. we didn't build one for consumer use, Suzuki did some hears later, when its primary designer moved from Kawasaki to Suzuki, it was later made into a smaller engine size, and called the RG500. We rode that Kawasaki prototype to give input on making a road racer out of them, to replace the H2R's. We got the KR750 instead.
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