Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 78

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IGNITION SYSTEM

IGNITION SPARK GAP

The following procedure applies to all of the ignition
coils.

1. Measure:

• Ignition spark gap

Out of specification 

→ Replace the ignition

coil(s).

Measurement steps:

• Disconnect the ignition coil 1 from the spark

plug.

• Connect the opama pet-4000 spark checker 2

or ignition checker 3.

• Measure the ignition spark gap 

a.

• Crank the engine by setting the engine stop

switch to “RUN” and turning the main switch to
start and gradually increase the spark gap until
a misfire occurs.

È For USA/Canada
É For Europe

Opama pet-4000 spark checker:

YM-34487

Ignition checker:

90890-06754

Ignition spark gap: 

6.0 mm (0.24 in)

È

É

IGNITION COIL

The following procedure applies to all of the ignition
coils.

1. Disconnect:

• Ignition coil coupler

2. Connect:

• Pocket tester

(to the ignition coil)

3. Measure:

• Primary coil resistance 

a 

• Secondary coil resistance 

b 

Out of specification 

→ Replace the ignition

coil(s).

Primary coil resistance:

1.19 ~ 1.61 

Ω at 20 °C (68 °F)

Secondary coil resistance:

8.5 ~ 11.5 k

Ω at 20 °C (68 °F)

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IGNITION SYSTEM

CRANKSHAFT POSITION SENSOR

1. Disconnect:

• Crankshaft position sensor coupler 

2. Connect:

• Pocket tester

(to the crankshaft position sensor coupler)

3. Measure:

• Crankshaft position sensor resistance

Out of specification 

→ Replace.

Crankshaft position sensor resis-
tance:

336 ~ 504 

Ω at 20 °C (68 °F)

(Gray – Black)

Gy

B

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THROTTLE OVERRIDE SYSTEM (T.O.R.S.)

WARNING

• If the T.O.R.S. is activated, make sure that the

cause of the malfunction has been corrected
and that the engine can be operated without a
problem before restarting the engine. 

• Be sure to use the specified spark plug and

ignition coil. Otherwise, the T.O.R.S. will not
work properly. 

If the throttle bodies or throttle cable malfunctions
during operation, the T.O.R.S. will operate when
the throttle lever is released.
The T.O.R.S. is designed to override the fuel injec-
tion and limit the engine speed to less than the
clutch engagement speed if the throttle valves fail
to return to the idle position when the throttle lever
is released.

È Idling/starting
É Running
Ê Trouble
1 Throttle position sensor (throttle valve position)
2 Throttle switch
3 Throttle cable
a On
b Off
c Open
d Closed

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

Mode

È 

Idling/ 

starting

É 

Running

Ê 

Trouble

Item

Throttle switch

Off

On

Off

Throttle posi-
tion sensor

Closed

Open

Open

Engine

Run

Run

T.O.R.S. will 

operate

È

É

Ê

IGNITION SYSTEM

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NOTE:

• When the T.O.R.S. is activated, the warning light

4 and self-diagnosis warning indicator 5 will
flash and the two-digit code “84”  6 will flash in
the odometer/tripmeter/engine speed meter LCD. 

• The T.O.R.S. monitors the condition of the throt-

tle position sensor, speedometer unit, and speed
sensor, and will operate if any of the monitored
items is disconnected or malfunctioning. 

4

6

5

ENGINE STOP SWITCH

1. Disconnect:

• Engine stop switch coupler

2. Connect:

• Pocket tester

(to the engine stop switch coupler)

3. Check:

• Engine stop switch continuity

Faulty 

→ Replace the right handlebar switch.

Switch position

Continuity

RUN (pulled out)

Yes

OFF (pushed in)

No

+

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Ω × 1

Br

Br/W

THROTTLE SWITCH

1. Disconnect:

• Throttle switch couplers

2. Connect:

• Pocket tester

(to the throttle switch couplers)

3. Check:

• Throttle switch continuity

Faulty 

→ Replace the right handlebar switch.

Throttle switch 

position

Continuity

Throttle lever is 
operated.

Yes

Throttle lever is not 
operated.

No

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Ω × 1

B/L

B/Y

IGNITION SYSTEM