there is a full rebuild thread on here somewhere but I cant find it so you can view it here : http://www.400greybike.com/forum/viewtopic.php?f=62&t=15710
if you want more info please ask, but the price is £4.2K as I dont really want to sell it but will at the right money.
http://nsr250.net/forums/viewtopic.php?t=8807
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold