From memory, the oval pistons was an idea about getting more valve area for higher gas flow without increasing the cylinder count/capacity much.
It was a bit of a "hack" to get around rules (forget whether it was capacity or cylinder count), but yeah - didn't exactly work as well as planned.
As you can probably understand, I believe the oval pistons caused all sorts of interesting issues with regards to thermal expansion, etc.
edit:
Honda NR - Wikipedia, the free encyclopedia
Was cylinder count...
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The final 500cc race version was capable of developing approximately 130bhp at over 20,000rpm.
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Not bad for a 500cc *4 stroke* ...
btw... the NR oval pistons have little to do with the VFR... not sure why they were posted up, but...
