Yamaha Water Return Pipe YF1-62417-33-70. Overview. The Yamaha YF1-62417-33-70 Water Return Pipe is a genuine original equipment manufacturer component designed to guide coolant back through the engine's cooling system. This pipe plays an important role in maintaining proper coolant circulation, helping regulate engine temperature and support consistent engine performance.. Efficient coolant return is essential for preventing overheating and ensuring the cooling system operates correctly. Over t