Yamaha TMAX 2020 - Checking the Thermostat; Installing the Thermostat Assembly

6-10
THERMOSTAT
EAS30443
CHECKING THE THERMOSTAT
1. Check:
• Thermostat
Does not open at 82–95 C (179.6–203 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 ther-
mostat and thermometer’s indicated tem-
perature.
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
Cracks/damage  Replace.
EAS30445
INSTALLING THE THERMOSTAT
ASSEMBLY
1. Install:
• Thermostat
TIP
Install the thermostat with its jiggle valve “a”
facing upward.
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.
A. Fully closed
B. Fully open
C. 82 C (179.6 F)
D. 95 C (203 F)
E. 8 mm (0.31 in)
G089032
B
CD
E
A
G089033
a