Next we pulled off the oil pan and removed the H tube oil passage tube and the J oil passage tube. ZX900-R motors had a reputation for oil starvation in certain cases. Well we could see why. In the photo to the right we have one end of the H tube. As you can see when the tube was manufactured the long tube is protruding into the other a significant amount. This obstruction not only restricts oil flow but induces turbulence in the flow which can cause cavitation and the introduction of air bubbles or foaming of the oil. A definite No No. We used a round file and removed the intruding material and deburred the junction.

To the left is the J tube. We removed a similar obstruction from the "T" on this part as well. Another note, the banjo bolts that secure the external oil lines to and from the Oil Cooler and the supply lines to the CAM gallery have only one hole drilled for oil flow. Also the hole is much smaller than the inner diameter of the supply lines. We drilled a additional hole and opened up the diameter of the existing holes in the banjo bolts to assure sufficient oil flow to all components.