Yamaha YZF-R1 Series Service Manual page 400

EAS31660
REMOVING THE THERMOSTAT ASSEMBLY
1. Remove:
• Hose clamp (Clic-R)
Refer to "REMOVING THE RADIATOR" on
page 6-5.
• Radiator inlet hose
2. Remove:
• Thermostat assembly
EAS30443
CHECKING THE THERMOSTAT
1. Check:
• Thermostat
Does not open at 69–73 °C (156–163 °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.
G089032
B
A
C
G089033
A. Fully closed
B. Fully open
C. 71 °C (159.8 °F)
D. 85 °C (185.0 °F)
E. 8 mm (0.31 in)
TIP
If the accuracy of the thermostat is in doubt, re-
place it. A faulty thermostat could cause serious
overheating or overcooling.
E
D
6-11
2. Check:
• Thermostat housing
• Thermostat housing cover
Cracks/damage → Replace.
EAS30444
ASSEMBLING THE THERMOSTAT
ASSEMBLY
1. Install:
• Thermostat housing "1"
• Thermostat "2"
• O-ring "3"
New
• Thermostat housing cover "4"
Thermostat housing cover nut
10 N·m (1.0 kgf·m, 7.4 lb·ft)
TIP
Install the thermostat with its breather hole "a"
facing up.
4
EAS30445
INSTALLING THE THERMOSTAT
ASSEMBLY
1. Install:
• Thermostat assembly
2. Install:
• Radiator inlet hose
• Hose clamp (Clic-R)
Refer to "INSTALLING THE RADIATOR" on
page 6-5.
TIP
For more information about installing the hose,
refer to "CABLE ROUTING" on page 2-17.
3. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-32.
4. Check:
• Cooling system
Leaks → Repair or replace any faulty part.
THERMOSTAT
a
1
2
2
3
New