I did the TPS Reset/ Recalibration twice but no difference. I'm gonna replace the FPR or the whole (ZX14) pump assembly when I get a chance in a couple of days & update you all.
Here's the Fuel Pressure Regulator; same for all bikes!
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F173748331444
I'm sorry if I again seem to be quite blunt about buying "stuff' off ebay, but if you actually looked, and I'm sure you didn't, you would find as I said, you can't buy that individual KAW OEM part...
the numbers they used on the website you linked, are for a complete pump assembly.. I don't think you are really getting this thing, about "real" vs "available" parts people sell..
I just did a complete fuel pump clean/filter/reinstall about 2 weeks ago.. i assure you you are gambling and tossing money to an E-bay vendor, that is falsly representing what he has in hand... it's your $$$$$.. and your bike, but man, be a bit more dilligent, run numbers, and check sources.
actually, when you go to the "source", and compare the fuel pump assembly, and this supposed regulator, they repeat the exact same numbers.. can you buy things online, from a source with little credibility, when they make such grave errors in the marketing, and part number's you expect?
https://www.fuelpumpfactory.com/collections/all/motorcycles---scooters-2008-kawasaki-concours-14--zg1400--efi-esr4669762as for the TPS reset thing... we hashed this all out for a decade.. it's pure hogwash, with regard to the C14.. it will do nothing.. I did it many times, trying to believe it, but in the end, consorting with my long time mechanical cronies, we have found the ECU is what it is, you can't "re-set" anything, like the off-on-off throttle thing was touted to do.. this came directly as a result of BMW's systems, used on the GS series, and does not in any way shape, or form, even make a difference when attempted on a C14.
The ONLY thing, that will change throttle roll on roll off, is a flash. Whomever you choose to perform it, is up to you. I have a Mountain Runner Premium flash, a couple weeks old... my miles per gallon went from approx 40, to 53 even tho I was abusing the bike much harder, than ever before.. to test the flash.. I can't say enough about just HOW MUCH, it changed my '08.