I have some NSR parts up on Ebay
most of a motor from an MC21: http://cgi.ebay.com/ebaymotors/_W0QQcmdZViewItemQQ_trksidZp3984Q2em1555Q2el2649QQitemZ140607604335QQsspagenameZSTRKQ3aMESELXQ3aIT
and carbs from an MC16: http://cgi.ebay.com/ebaymotors/_W0QQcmdZViewItemQQ_trksidZp3984Q2em1555Q2el2649QQitemZ140607639815QQsspagenameZSTRKQ3aMESELXQ3aIT