Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 65

6-4

COOL

RADIATOR

INSTALLATION

1. Install:

• Radiator stay 1 
• DC back buzzer 2 (For reverse model)

NOTE:

• Hook the hooked portion 

a of the brake hose

holder onto the radiator stay, and then fasten the
holder with the bolt.

• Be sure to install the DC back buzzer so that a

line drawn through the center of the buzzer is par-
allel to the rear frame cross member as shown in
the illustration. (For reverse model)

T

 

R

.

.

Radiator stay bolt:

7 Nm (0.7 m · kg, 5.1 ft · lb)

1

2

a

6-5

COOL

THERMOSTAT

THERMOSTAT

Order

Job name/Part name

Q’ty

Remarks

Thermostat removal

Remove the parts in the order listed below.

Coolant

Drain.
Refer to “COOLING SYSTEM” in CHAPTER 
2.

Air filter case

Refer to “AIR FILTER CASE” in CHAPTER 7.

1

Radiator inlet hose

1

Disconnect.

2

Throttle body heater inlet hose

1

Disconnect.

3

Thermostat inlet hose

1

Disconnect.

4

Thermostat outlet hose

1

Disconnect.

5

Coolant temperature sensor sub-lead

1

6

Coolant temperature sensor

1

7

Thermostat housing cover

1

8

Thermostat

1

9

Thermostat housing

1

For installation, reverse the removal proce-
dure.

È

6

5

É

9

8

7

New

4

2

3

1

10 Nm (1.0 m 

•

 kg, 7.2 ft 

•

 lb)

23 Nm (2.3 m 

•

 kg, 17 ft 

•

 lb)

È:   
É:   

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

6-7

COOL

WATER PUMP

WATER PUMP

Order

Job name/Part name

Q’ty

Remarks

Water pump removal

Remove the parts in the order listed below.

Engine assembly

Refer to “ENGINE ASSEMBLY” in CHAPTER 
5.

1

Timing mark accessing screw

1

2

Crankshaft end cover

1

3

Water pump assembly

1

4

Gasket

2

5

Dowel pin

2

6

Plug/O-ring

1/1

7

Circlip

1

8

Bearing

1

For installation, reverse the removal proce-
dure.

È

5

8

7

4

6

3

1

2

New

New

New

New

New

E

LS

LS

12 Nm (1.2 m 

•

 kg, 8.7 ft 

•

 lb)

È:   

(3)

(4)