Senza,

I'm almost positive that the cbr 600 f3 stock shock is actually a bit shorter than the MC21 shock, and that because it lacks ride height adjustabiity, ride height on the NSR would actually be reduced therefore. I looked into this a long time ago and so can't remember the specifics, but it was something like 305mm for NSR versus 295mm for CBR f3.
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-Jim
'93 MC21