To be fair, a non running MC18 isnt worth much at all. Cracking bike all the same (I like the '18 the most out of all the NSR's) but they dont fetch that much money and most parts for them now are discontinued.
I would look very hard at buying a non runner to make sure the parts it requires are still avaliable as alot for the '18 are not now.
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If I have to take the carbs off once more...