With a quantity of thirty-two pieces, the Collet is the most used part in the VALVE(S) diagram.
Some items from this specific schematic: Seat-spring, Valve-intake, Shim,t=2.80, Shim,t=2.25.
The most reasonably priced component used on the Zx750h2 Zxr750 1990 Europe Uk Fr Ar Fg Gr It Nr Sd Sp St Valve(s) is the Collet.