Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 6

2-13

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ADJ

THROTTLE BODY SYNCHRONIZATION

2. Remove:

• Vacuum caps 1 

1

1

3. Install:

• Vacuum gauge 1 

4. Install:

• Fuel tank

Refer to “SEAT AND FUEL TANK” in CHAP-
TER 5.

5. Start the engine and let it warm up for several

minutes, and then let it run at specified engine
idling speed.

6. Adjust:

• Throttle body synchronization

Vacuum gauge:

90890-03094

Carburetor synchronizer:

YU-44456

Engine idle speed:

1,450 ~ 1,550 r/min

1

2-14

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THROTTLE BODY SYNCHRONIZATION

THROTTLE CABLE FREE PLAY ADJUSTMENT

Adjustment steps:

• With throttle body #1 as standard, adjust throttle

body #1 and #2 using the synchronizing screws
1.

NOTE:

After each step, rev the engine two or three times,
each time for less than a second, and check the
synchronization again.

NOTE:

The difference in vacuum pressure between two
throttle bodies should not exceed 1.3 kPa (0.01
kg/cm

2

, 0.18 psi).

7. Stop the engine and remove the measuring

equipment.

8. Adjust:

• Throttle cable free play

Refer to “THROTTLE CABLE FREE PLAY
ADJUSTMENT”.

Carburetor angle driver 2:

90890-03173

Vacuum pressure at engine idling 
speed:

25.37 ~ 28.03 kPa
(0.25 ~ 0.28 kg/cm

2

, 3.61~ 3.99 psi)

1

1

THROTTLE CABLE FREE PLAY 
ADJUSTMENT

NOTE:

Adjust the throttle cable free play while the cable is
in the cable guide.

1. Measure:

• Throttle cable free play 

a 

Out of specification 

→ Adjust.

Throttle cable free play:

3.0 ~ 4.0 mm (0.12 ~ 0.16 in)

a

2-15

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ADJ

THROTTLE CABLE FREE PLAY ADJUSTMENT

2. Adjust:

• Throttle cable free play

Throttle body side adjustment steps:

• Remove the left side cover.

Refer to “COVERS” in CHAPTER 3.

• Loosen the locknut 1.
• Turn the adjusting nut 2 in direction 

a or b

until the specified free play is obtained.

• Tighten the locknut.

NOTE:

If the specified throttle cable free play cannot be
obtained on the throttle body side of the cable, use
the adjusting nut on the handlebar side. 

Direction 

a

Free play is increased.

Direction 

b

Free play is decreased.

2

1

a

b

Handlebar side adjustment steps:

• Slide back the rubber cover.
• Loosen the locknut 1.
• Turn the adjusting nut 2 in direction 

a or b

until the specified free play is obtained.

• Tighten the locknut.
• Slide the rubber cover to its original position.

NOTE:

After adjusting the free play, turn the handlebar to
right and left, and make sure that the engine idling
does not run faster.

Direction 

a

Free play is increased.

Direction 

b

Free play is decreased.

1

a

b

2

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THROTTLE OVERRIDE SYSTEM (T.O.R.S.) CHECK

THROTTLE OVERRIDE SYSTEM (T.O.R.S.) 
CHECK

WARNING

When checking the T.O.R.S.:
• Be sure the parking brake is applied.
• Be sure the throttle lever moves smoothly.
• Do not rev the engine to the point that the

clutch engages, otherwise, the snowmobile
could start moving forward unexpectedly,
which could cause an accident.

1. Start the engine.
2. Hold the pivot point of the throttle lever away

from the throttle switch by putting your thumb
(above) and forefinger (below) between the
throttle lever pivot 1 and engine stop switch
housing 2.
While holding as described above, press the
throttle lever 3 gradually.
The T.O.R.S. will be activated and the engine
speed will be limited to less than the clutch
engagement speed.

WARNING

If the engine speed does not decrease to less
than the clutch engagement speed, stop the
engine by turning the main switch to the off
position and check the electrical system.

Engagement speed:

FX10/FX10RT/FX10RTR/FX10RTRA

3,550 ~ 3,950 r/min

FX10MT/FX10MTR “USA/Canada”/
FX10MTRA “USA/Canada”

3,300 ~ 3,700 r/min

FX10MTR “Europe”/FX10MTRA
“Europe”

3,100 ~ 3,500 r/min