Ladies (if any) and gentlemen, is this not the most beautiful thing you have ever seen?

http://www.aaenperformance.com/V4_racing_engine.asp

This has no chance of fitting into an NSR, but could be stuffed into an R-1...

...maybe.

( wonder if I've found this here on this site in the past )
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Party hardy all night long till the sun comes up and the cows come home. Yeow!

Ok, after a bit of obvious thinking ( and a six pack ) it seems obvious that there is no gearbox housing present. That would have to come down to a custom job with a transmission transverse mounted and I don't recall anything like that on a bike nowadays.

Aw heck. This is most likely too much for a bike anyway.
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Party hardy all night long till the sun comes up and the cows come home. Yeow!