Wider Tires will in most case's prevent the bike from turning quick, you know corner after corner flickability....you will lose that on a 190 tire. Thats why the FZR's are considered to be very flickable bikes because they come standard with a 140 I believe rear tire. I gotta double check that.
So in conclusion you sacrifice a less agressive looking/more usefull thinner rear tire to go with a wider more aggressive looking/waste of rubber tire, and for what?
But its up to you...Like these guys said earlier I'm sure it would fit, but I don't know how it would ride....
Edit* Went on FZR Archives.com said 140 so I guess they are right....