Yamaha YZF-R125 Service Manual: Checking the thermostat

Yamaha YZF-R125 Service Manual / Cooling system / Thermostat / Checking the thermostat

1. Check:

Thermostat Does not open at 80.5-83.5 C (176.9-182.3 F) Replace.

a. Suspend the thermostat "1" in a container "2" filled with water.

b. Slowly heat the water "3".

c. Place a thermometer "4" in the water.

d. While stirring the water, observe the thermostat and thermometer's indicated temperature.

Checking the thermostat

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 overcooling.

2. Check:

Thermostat cover Cracks/damage Replace.

3. Check:

Radiator inlet hose Cracks/damage Replace.

Installing the thermostat

1. Install: Thermostat NOTE: Install the thermostat with its breather hole "a" facing up. 2. Install: Copper washer Coolant temperature sensor CAUTION:Use extreme care when ...

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