Kawasaki ,Air screw with spring  , Fits models listed above but maybe not all years , please use part number to ensure this is correct for your exact year and model  

Good used condition from a Z1000J Carburettor set

Part number 16014 1014

Please be sure from the photo and information given that this is the part you require 

Feel free to message me for any more information

SL Z750L3 carb box