Yamaha FX Nytro FX10MTRAX, Service Manual, Page: 546 / 859

6-6
COOL
THERMOSTAT
INSPECTION
1. Inspect:
• Thermostat
Does not open at 69.0 ~ 73.0 °C (156.2 ~
163.4 °F)
→
Replace.
Inspection steps:
• Suspend the thermostat 1 in a container 2
filled with water.
• Slowly heat the water 3 .
• Place a thermometer
4
in the water.
• While stirring the water, observe the thermostat
and thermometer’s indicated temperature.
È
Fully closed
É
Fully open
Ê
More than 8 mm (0.31 in)
NOTE:
If the accuracy of the thermostat is in doubt,
replace it. A faulty thermostat could cause serious
overheating or overcooling.
2. Inspect:
• Thermostat housing cover
• Thermostat housing
• Thermostat inlet hose
• Thermostat outlet hose
• Throttle body heater inlet hose
Cracks/damage
→
Replace.
INSTALLATION
1. Install:
• Thermostat
(into the thermostat housing)
NOTE:
Install the thermostat with its breather hole
a
as
shown in the illustration.
2. Install:
• Coolant temperature sensor
(to the thermostat housing)
CAUTION:
Use extreme care when handling the coolant
temperature sensor. Replace any part that was
dropped or subjected to a strong impact.
T
R
.
.
Coolant temperature sensor:
23 Nm (2.3 m · kg, 17 ft · lb)
a