Checking The Thermostat; Installing The Thermostat Assembly - Yamaha MT-09 2021 Service Manual

EAS30443

CHECKING THE THERMOSTAT

1. Check:
• Thermostat
When the water temperature in the specified
value, the thermostat does not fully open. →
Replace.
Valve full open temperature
95.0 °C (203.00 °F)
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 ther-
mostat and thermometer's indicated tem-
perature.
G089032
TIP
If the accuracy of the thermostat is in doubt, re-
place it. A faulty thermostat could cause serious
overheating or overcooling.
2. Check:
• Thermostat cover
• Thermostat housing
Cracks/damage → Replace.
EAS30445
INSTALLING THE THERMOSTAT
ASSEMBLY
1. Install:
• Thermostat
2. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-31.
3. Check:
• Cooling system
Leaks → Repair or replace any faulty part.
Refer to "INSTALLING THE RADIATOR" on
page 6-5.
4. Measure:
• Radiator cap valve opening pressure
Below the specified pressure → Replace the
radiator cap.
Refer to "CHECKING THE RADIATOR" on
page 6-5.
6-10
THERMOSTAT