Hi There
The HRC gear clusters I have, have nf5 on the selector forks and the gear cogs themselves have a part number on that matches the RS 250 parts book,
All the bikes I have with them in have an extremely long first gear and very close throughout the shifts,
I doubt if you could visibly see a difference unless you spent a lot of time around nsr gear kits,
All the best,
jonmac
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John