I do believe the F2 motor has a lower revlimit and doesn't have a throttle position sensor to adjust the ignition maps like on the F3.
This couldn't be remedied by just plugging in a F2 ignition controller (blackbox) in my F3 harness would it? I can hope, can't I? :)
From what I understand, electrics in F2's and F3's are the same.
Dear Crazy incorporated,
If you're still monitoring this thread, check out http://pub105.ezboard.com/bhondacbr600f4 for an answer to your question.
H-man
Wow, wish I would have know about that site when I raced Honda's.