More info at: http://www.rscycles.com/Bikes/250/02%20rs250/250cc2.htm

Top end is recommended at 300 miles, with a crank at around (I think) 2500 miles. You can get one from Rising Sun Cycles if your in the US. Outside the US, don't know.

They cost about 20K new, can be had used for less. The engine shares being a 2-stroke with the NSR, and that's about it. It's a serious race bike from HRC, and more then a handful to ride fast. Riding it slow is proving to be hard as well.
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Charles Gallant