Checking the thermostat (Yamaha FZ1)

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1. Check:

• Thermostat

Does not open at 71-85°C (160-185°F) → Replace.



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.

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.

See this article in russian language

Article about repair motorcycles «Yamaha Fazer FZ1» (2006-2015): «Checking the thermostat»: https://motoinstruction.ru/en/Yamaha/Fazer/FZ1/engine/cooling/110852 <a href="https://motoinstruction.ru/en/Yamaha/Fazer/FZ1/engine/cooling/110852">Checking the thermostat</a> - article about repair motorcycles «Yamaha Fazer FZ1» (2006-2015) from section «Cooling system». [url=https://motoinstruction.ru/en/Yamaha/Fazer/FZ1/engine/cooling/110852]Checking the thermostat[/url] - article about repair motorcycles «Yamaha Fazer FZ1» (2006-2015) from section «Cooling system».