Re: Fitting curved rad in an 86 GSXR with 89 GSXR RR fairing who has done it?
Um, I think you mean the curved oil cooler, stock on 90-92 (US) 750's, and 89-92 1100's. A RAD would be for coolant, not oil...
In any case, I have mounted those coolers on 85 750's more than once, and on an 87 1100 I had last year. None of those had fairings though, so I cannot comment on that fitment part.
The curved oil cooler is reputed to be 33-48% more efficient than the flat ones.
1990 GSXR750, reasonably modded