Yamaha - Impeller - 67F-44352-00-00Yamaha Impeller Cooling System Component 67F 44352 00 00 Overview If theres one part I never gamble with on a Yamaha, its the impeller. Once it starts to wear down, youll see it in water pressure and engine temps pretty quick. Ive pulled plenty of old ones that looked fine at a glance but werent moving enough water anymore. A fresh impeller keeps the cooling system doing its job so you can run without worrying about overheating. Key Features