but for a track bike, i would reccomend a TZ250 or an RS 250
both can be had for the 3 - 4 k range for 93-96 range
and more for newer
the amount of money you would need to put into an NSR to get it closer to the power of either of those would not make sense, and the NSR reliabliity would go down as the power goes up... not to mention the extra weight of the NSR...
check out www.tz250racing.com
they have both types of bikes there in the classifieds
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Koren
2 Strokes and I'm Off