Ah! Forget it. I've just decided it would be waaay too much trouble to put the MC21 back to NSR status, it's got RS250 tank, bodywork, airbox, etc.. I'd probably have to change the rear frame.
So I'm going to sell it complete ... see the classifieds section!
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-