Clarkie, I have a good friend with a 93/98 RS that does just that. He's my 'consultant' on anything technical and I trust his mechanical judgment, and runs his RS with a very conservative set-up. It makes 83bhp at the wheel and he usually gets 5-8 track days out it before a rebuild. Each time the old parts have looked pretty much perfect. Rebuilds are about 30% less than the nsr too from memory... He runs it on AvGas though and it's probably the safest fuel to keep them on. Another guy runs his 2000 RS on Supergreen with octane booster but Supergreen is about 13 quid a litre I think!!
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NSR300R - Why did i ever have a 250...