as long as it has new fuel, good plugs, a good battery, good quality 2T oil (i dont know if that goes off) and gearbox oil , you should be good to go.
there are a lot of things to go wrong with a twostroke, but by buting an NSR you are looking at buying the best.
take someone with a bit of twostroke knowledge with you when you go and look at it. hope that helps a bit.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold