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Anyone seen this before?

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K2-K6:
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Found it in a recent 2011 bike mag,  never seen it before but interesting.

SteveD CB500K0:
Water cooled?


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JamesH:
2-stroke?

K2-K6:
I had the advantage of seeing it within an article on rotary valves else I'd not have guessed.

Basically a special head with a big ported camshaft instead of valves to get gases in and out.

Used in Australian Greg Kensig's sidecar racer, I've never seen it before.

MrDavo:
Looks all CB750 below the base gasket, I’m guessing there’s a sleeve spinning round with carefully timed passages to let gasses in and out, with no valves to tangle I’m guessing it will take more revs, and use less power, but surely you’d still need a camchain to keep it in time.

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