Just had a look in bottom of ZRX forkleg lower- got a replacement one which I haven't fitted yet. I can't see how the adjuster in the bottom affects anything. It doesn't seem to connect to anything and is in a recess of it's own. Does it somehow connect to the bottom of the cartridge? How does this little sucker work, if it does? I know late 90s GSXRs did nothing when you turned adjusters on the forks. Are ZRXs the same?
I needed to tighten the footpeg bracket on the RHS yesterday while out on a ride and was shocked to find two allen keys in the factory kit, neither of which fitted. A mate's XJR1300 kit didn't either- no allen keys on them!

After going over the whole bike I added the correct tools today from my old ZZR1200 kit. Might be worth a check if you own a ZRX. Maybe they just forgot to add them to my kit?
2 X ZRX1200R 4 X ER6N, GT550, 1988 ZX-10, 4 X GPZ250R, 4 X GPZ900R and GPZ750R

Yeah I like Kawasakis.