Yamaha - Oil Pump Assembly Engine Lubrication System 6EK-13300-00-00. Overview. When an engine loses proper oil flow, things go downhill fast-that's why I never take chances with oil pumps. This is the part that keeps everything inside the motor coated and protected while it's running hard. I've seen engines saved-and engines ruined-based on whether this piece was doing its job. With a solid pump in place, you can run with confidence knowing everything's getting the lubrication it needs.. Key Fe