Hey I have a F3 rim for sale!
The only reason to change to 17" is for the greater choices in race rubber. I have 30,000+ miles on street and probably 3,000+ track miles on the 1996 CBR900RR and it does handle different but I was able to get the same lap times with both wheel types.
So if it's a street bike, leave it.
If it's a race bike, only do it if needed to get the race rubber you want.
I'm about to put up a $600 package for sale, F3 rim, Scotts damper, Erion triple, titanium clip-ons. A complete convert-to-race package for the 96/97 CBR900RR. Well I guess not complete because I'd do a pipe and rearsets and some engine work and put that sucker in the vintage class.