Yamaha FZ1-N Service Manual page 300

EAS26450
CHECKING THE THERMOSTAT
1. Check:
• Thermostat
Does not open at 71 – 85°C (160 – 185°F)
→ Replace.
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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 ther-
mostat and thermometer's indicated tem-
perature.
A. Fully closed
B. Fully open
NOTE:
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause seri-
ous overheating or overcooling.
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2. Check:
• Thermostat housing cover "1"
• Thermostat housing "2"
Cracks/damage → Replace.
EAS26460
ASSEMBLING THE THERMOSTAT ASSEM-
BLY
1. Install:
• Thermostat housing "1"
• Thermostat "2"
• O-ring "3"
• Thermostat housing cover "4"
Thermostat housing cover nut
10 Nm (1.0 m·kg, 7.2 ft·lb)
NOTE:
Install the thermostat with its breather hole "a"
facing up.
EAS26480
INSTALLING THE THERMOSTAT ASSEM-
BLY
1. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-19.
2. Check:
• Cooling system
Leaks → Repair or replace any faulty part.
3. Measure:
• Radiator cap opening pressure
6-8
THERMOSTAT