Yamaha - Cooler - 69J-21841-02-00Yamaha Cooler Engine Cooling Component 69J 21841 02 00 Overview Cooling issues are one of those things you feel fast, especially when you're pushing the motor or running long days. This cooler helps keep temperatures in check so everything runs smooth and doesnt get stressed. When they start clogging up or corroding, performance drops and you risk bigger problems. Swap in a fresh one, and the motor settles back into a steady, reliable operating temp.