FZR 1000 1992 8,948 miles( yes it's mint).
I have a problem with a perfect running bike, full power

I have balanced the carbs, adjusted the throttle cables to slacken them off, adjusted the EXUP cables.
I thought the sevo was a bit slow? but when i shut the throttle off the revs hold for a second or so, then slowly drop off to a steady tickover!
Help Please