Master Cylinder

I believe the 14mm master cylinder is the same fitment as the 5/8 Nissin item on the ZX7R and ZX9R amongst others. TBH I have used a 14mm M/C on my ZX with no noticeable difference in performance. Only when I upgraded to 6 pot Nissin calipers did I find a benefit in going to the 5/8's, the 14mm giving a little too much lever travel.

 

Yes. I was in jack Lilley's team and we changed from stock 14mm to 5/8". (on T595 and TT600)
It was from a yzf 750 but was a remote resovoir type so the yam part was literally the m/c.
Now I would still be using remote but look at the radial m/c as used on daytona 675, street triple R or some speeds 1050's also late Suzuki GSXR. But you will also need a new hose and lever. Otherwise 5/8" wise there are many to chase from as again it is a nissin part used by suzuki kawasaki and yamaha.