Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 62

5-68

ENG

CRANKSHAFT AND BALANCER SHAFT

CRANKSHAFT AND BALANCER SHAFT

Order

Job name/Part name

Q’ty

Remarks

Crankshaft and balancer shaft removal

Remove the parts in the order listed below.

Crankcase

Separate.
Refer to “CRANKCASE”.

Connecting rod caps

Refer to “CONNECTING RODS AND PIS-
TONS”.

1

Crankshaft

1

2

Crankshaft journal bearing

8

3

Primary sheave drive shaft assembly

1

4

Bearing

1

5

Lock washer

2

6

Washer

2

7

Right balancer weight

1

8

Left balancer weight

1

9

Water pump drive gear

1

10

Spacer

1

11

Bearing

1

E

New

LT

E

E

E

E

16

17

2

2

2

3

4

2

2

New

5

6

8

9

10 11

12

15

14

7

6

5

New

13

É

É

E

10 Nm (1.0 m 

•

 kg, 7.2 ft 

•

 lb)

È:   

1

35 Nm (3.5 m 

•

 kg, 25 ft 

•

 lb)

É:   

È

LS

2

2

2

5-69

ENG

CRANKSHAFT AND BALANCER SHAFT

Order

Job name/Part name

Q’ty

Remarks

12

Balancer shaft

1

13

Balancer driven gear

1

14

Bearing retainer

1

15

Bearing

1

16

Circlip

1

17

Bearing

1

For installation, reverse the removal proce-
dure.

E

New

LT

E

E

E

E

16

17

2

2

2

3

4

2

2

New

5

6

8

9

10 11

12

15

14

7

6

5

New

13

É

É

E

10 Nm (1.0 m 

•

 kg, 7.2 ft 

•

 lb)

È:   

1

35 Nm (3.5 m 

•

 kg, 25 ft 

•

 lb)

É:   

È

LS

2

2

2

5-70

ENG

CRANKSHAFT AND BALANCER SHAFT

REMOVE

1. Remove:

• Crankshaft journal lower bearings

(from the lower crankcase)

• Crankshaft journal upper bearings

(from the upper crankcase)

NOTE:

Identify the position of each crankshaft journal
upper bearing so that it can be reinstalled in its orig-
inal place.

2. Straighten the lock washer tab.
3. Loosen:

• Balance weight bolts 1 

NOTE:

Place a piece of wood 

a between the balancer

weight 2 and crankcase.

4. Remove:

• Right balancer weight
• Left balancer weight

a

1

2

a

1

2

5-71

ENG

CRANKSHAFT AND BALANCER SHAFT

INSPECTION

1. Measure:

• Crankshaft runout

Use the V-blocks and a dial gauge.
Out of specification 

→ Replace the crank-

shaft.

Dial gauge:

90890-03097

Dial indicator gauge:

YU-A8428

Crankshaft runout:

0.03 mm (0.0012 in)

2. Inspect:

• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces

Scratches/wear 

→ Replace the crankshaft.

3. Inspect:

• Bearings

Clean and lubricate the bearings, then rotate
the inner race with your finger.
Rough movement 

→ Replace.

4. Inspect:

• Balancer drive gear
• Balancer driven gear

Damage/wear 

→ Replace the crankshaft

assembly and balancer driven gear as a set.
Excessive noise during operation 

→ Replace

the crankshaft assembly and balancer driven
gear as a set.

5. Inspect:

• Primary sheave drive shaft assembly

Damage 

→ Replace.

6. Measure:

• Crankshaft-journal-to-crankshaft-journal-

bearing clearance
Out of specification 

→ Replace the crankshaft

journal bearings.

Crankshaft-journal-to-crankshaft-
journal-bearing clearance:

0.027 ~ 0.045 mm
(0.0011 ~ 0.0018 in)