The most reasonably priced component used on the Zx750e1 1984 Europe Fr Fu Gr It Nr Sd St Valve is the Collet,retainer.
With sixteen applications this Collet,retainer is the most specified part.
Some items from this specific schematic: Shim,t=2.45, Shim,t=3.05, Shim,t=2.20, Shim,t=2.85.