FYI...
for the cbr 2000 the key code is on the back of the ignition lock, very tough to see. but with that combination they can make you a key

 

I have only 1 key with the F2 I just got(1991). I took it and the registration to a Honda dealer. They said they needed the code that was on the factory key, not the vin. Since I didnt have a factory key, they had to try to measure it, but that didnt work.

kingmal, would a key code be on a 1991 ignition?

Thanks