Yamaha - Water Pipe Assembly Cooling System Component YF1-89617-29-53. Overview. When you're dealing with Yamaha cooling systems, water flow has to stay consistent from the pump all the way through the engine. I've seen small issues in piping cause overheating problems that are tough to track down at first. The Yamaha Water Pipe Assembly YF1-89617-29-53 is what keeps that flow moving clean and uninterrupted. When it's in good shape and properly installed, the engine stays cool and runs the way i