Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 75

7-30

FI

THROTTLE BODY

INJECTORS

Order

Job name/Part name

Q’ty

Remarks

Injectors removal

Remove the parts in the order listed below.

1

Throttle position sensor coupler

1

Disconnect.

2

Intake air pressure sensor 2 (cylinder #1) 
coupler

1

Disconnect.

3

Intake air pressure sensor 1 (cylinders #1, 
#2, and #3) coupler

1

Disconnect.

4

Cylinder-#1 injector coupler

1

Disconnect.

5

Cylinder-#2 injector coupler

1

Disconnect.

6

Cylinder-#3 injector coupler

1

Disconnect.

7

ISC (idle speed control unit) coupler

1

Disconnect.

8

Fuel injection system sub-wire harness

1

9

Throttle position sensor

1

10

Negative pressure hose

5

11

ISC (idle speed control) unit hose

1

12

Intake air pressure sensor 2 (cylinder #1)

1

14

15

15

15

11

10

10

12

13

10

9

10

10

8

6

5

4

1

2

3

7

New

New

New

7-31

FI

THROTTLE BODY

Order

Job name/Part name

Q’ty

Remarks

13

Intake air pressure sensor 1 (cylinders #1, 
#2, and #3)

1

14

Fuel rail

1

15

Injector

3

For installation, reverse the removal proce-
dure.

14

15

15

15

11

10

10

12

13

10

9

10

10

8

6

5

4

1

2

3

7

New

New

New

7-32

FI

THROTTLE BODY

REMOVAL

1. Extract the fuel in the fuel tank through the fuel

tank cap with a pump.

2. Remove:

• Fuel hose

CAUTION:

• Be sure to disconnect the fuel hose by hand.

Do not forcefully disconnect the hose with
tools.

• Although the fuel has been removed from the

fuel tank be careful when removing the fuel
hose, since there may be fuel remaining in it.

NOTE:

• To remove the fuel hose from the throttle body,

slide the fuel hose connector cover 1 on the end
of the hose in direction of the arrow shown, press
the two buttons 2 on the sides of the connector,
and then remove the hose.

• Before removing the hose, place a few rags in the

area under where it will be removed.

INSPECTION

1. Inspect:

• Injectors

Damage 

→ Replace the defective parts.

2. Inspect:

• Throttle body

Cracks/damage 

→ Replace the throttle body.

3. Check:

• Fuel passages

Obstructions 

→ Clean.

NOTE:

• Use a petroleum based solvent for cleaning.
• Blow out all passage with compressed air.

4. Check:

• Throttle body joints

Cracks/damage 

→ Replace the defective

parts.

7-33

FI

THROTTLE BODY

FUEL PRESSURE INSPECTION

1. Inspect:

• Fuel pressure 

Measurement steps:

• Remove the fuel hose connector holder, and

then disconnect the fuel hose.
Refer to “SEAT AND FUEL TANK” in CHAP-
TER 5.

• Connect the fuel pressure adapter 1 between

the fuel hose 2 and fuel pump 3.

• Connect the pressure gauge 4 to the fuel pres-

sure adapter.

• Start the engine.
• Measure the fuel pressure.

Faulty 

→

 Replace the fuel pump.

Pressure gauge:

90890-03153
YU-03153

Fuel pressure adapter:

90890-03176
YM-03176

Fuel pressure:

324 kPa (3.24 kg/cm

2

, 46.1 psi)

4

3

2

1