- Thermostat
Does not open at 71-85°C (160-185°F) → Replace.
![](https://motoinstruction.ru/img/yamaha/3/112019.jpg)
a. Suspend the thermostat «3» in a container «4» filled with water.
b. Slowly heat the water «2».
c. Place a thermometer «1» in the water.
d. While stirring the water, observe the thermostat and thermometer’s indicated temperature.
![](https://motoinstruction.ru/img/yamaha/3/112020.jpg)
A. Fully closed; B. Fully open
Note: If the accuracy of the thermostat is in doubt, replace it. A faulty thermostat could cause serious overheating or over cooling.
2. Check:
- Thermostat housing cover «1»
- Thermostat housing «2»
Cracks/damage → Replace.
![](https://motoinstruction.ru/img/yamaha/3/112021.jpg)