FYI, A CBR600F4i brake master cyl has the same I.D. as the RC51 unit and it matches the clutch side master of the VFR perfectly.
Quick note to this - the F4i has a 5/8 m/c and a different lever ratio - than a RC51 which has a 11/16ths and a larger lever ratio. The F4i would drop performance to just about stock or slightly less. I took the brake performance gain over esthetics. I still built it ultra low profile and made it as much as an OEM design look as would be as possible. I think it looks as though Honda did it. MD
