IIRC, the service manual says something like 22 psi front and 28 psi rear. So far I have kept it around that and have no complaints. Mine were a bit low from the dealer, so I definitely recommend making it one of the first things people check on a new bike.
I'd probably go 26ish front and 32ish rear with those sizes, but I think you have a lot of play in those numbers. You could experiment with it too, start low and work your way higher and see how it feels. I usually like a bit higher than the recommended for motorcycle tires.
Did you have any fitment problems or did everything go right on nicely without mods?
A forum community dedicated to Kawasaki Z125 motorcycle owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, riding gear, troubleshooting, maintenance, and more!