Checking The Thermostat; Installing The Thermostat - Yamaha YZF-R15 Service Manual

CHECKING THE THERMOSTAT

1. Check:
• Thermostat
Does not open at 80.5–83.5 °C (176.9–182.3
°F) → Replace.
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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 thermo-
stat and thermometer's indicated tempera-
ture.
4
±
82 1.5
±
(179.6 2.7
A. Fully closed
B. Fully open
NOTE:
If the accuracy of the thermostat is in doubt, re-
place it. A faulty thermostat could cause serious
overheating or overcooling.
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3
1
2
95
203
6.5
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 New
• Coolant temperature sensor
Coolant temperature sensor
18 Nm (1.8 m·kg, 13 ft·lb)
CAUTION:
Use extreme care when handling the coolant
temperature sensor. Replace any part that
was dropped or subjected to a strong im-
pact.
3. Fill:
• Cooling system
(with the specified amount of the recom-
mended coolant)
Refer to "CHANGING THE COOLANT" on
page 3-14.
4. Check:
• Cooling system
Leaks → Repair or replace any faulty part.
5. Measure:
• Radiator cap opening pressure
Below the specified pressure → Replace the
radiator cap.
Refer to "CHECKING THE RADIATOR" on
page 6-3.
THERMOSTAT