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Hi I have a 1978 z1000. I'm having trouble with leaky carbs I've adjusted the float but that didn't solve it. The float valves are leaking even if i close them by hand. So i went to order new valves but my supplier keeps coming up with different ones from what i can tell the difference between mine and the ones in the manual mine don't have the adjustment at the bottom, the idle jet is smaller and the my float valve/valve seat is bigger. Can any one identify my carbs so i can get my hands on replacement bits. Thanks

Those are VM29 Smoothbore Mikuni's.  Very desirable, and worth upwards of a grand or more if in good condition.  

Congratulations!  As Nessism said, you have mikuni VM29 racing carbs.  You can get many parts from them here.

jetsrus.com/carburetor/carb_mikuni_VM29_...oded_view_parts.html
 

Yep...VM 29's.  The original VM26 carbs must have been replaced.  They might have been pumpers, which were probably the worst carbs ever used on the KZ1000 bike series.  Consider yourself very lucky!

Thanks everyone. I was a able to source most of the bits i needed now that I know whats on the bike. i can keep my eyes open for anything else in the future.