Snowmobile Yamaha FX10X, FX10RTX, FX10RTRX, FX10RTRAX, FX10MTX, FX10MTRX, FX10MTRAX. Manual - part 31

4-13

POWR

TR

SECONDARY SHEAVE

DISASSEMBLY

WARNING

• Use extreme CAUTION when disassembling

the secondary sheave since serious injury
can occur due to the sudden release of spring
tension. Use the sheave compressor to con-
tain the spring tension before removing the
spring seat nuts.

• Do not attempt this procedure unless you

have the proper tools and understand the
instructions thoroughly.

INSPECTION

1. Inspect:

• Sliding sheave
• Fixed sheave
• Spring seat

Cracks/damage 

→ Replace.

• Stopper

Wear/damage 

→ Replace.

2. Inspect:

• Bushing (spring seat) 1 
• Sliding sheave (V-belt contact surface) 2 

Scratches/wear/damage 

→ Replace.

• Sliding bushing 3 

Unsymmetrical wear/damage 

→ Replace.

3. Inspect:

• Secondary sheave spring 1 

Cracks/damage 

→ Replace.

4. Measure:

• Secondary sheave spring (standard) free

length 

a 

Below specification 

→ Replace the secondary

sheave spring.

Secondary sheave spring (standard) 
free length:

75.0 mm (2.95 in)

4-14

POWR

TR

SECONDARY SHEAVE

5. Measure:

• Ramp shoe thickness 

a 

Out of specification 

→ Replace the ramp

shoe.

Wear limit:

1.0 mm (0.04 in)

ASSEMBLY

1. Install:

• Secondary sheave spring 

1 

• Spring seat 2 

NOTE:

Hook the end of the secondary sheave spring into
the spring holes in the fixed sheave. Hook the other
end of the spring into the holes in the spring seat.

Standard spring position:

2-6 (FX10/FX10RT/FX10RTR/FX10RTRA)
1-6 (FX10MT/FX10MTR/FX10MTRA)

Installation steps:

• Hold the spring seat 1 and turn the fixed

sheave  2 counterclockwise to the specified
angle 

a.

NOTE:

The holes in the spring seat should align with the
bolts on the sliding sheave.

a = (sheave hole number + spring seat hole
number) 

× 10

• Push down on the spring seat until the bolts

come through the holes.

• While pushing down on the spring seat, install

the nuts and tighten them to the specified
torque.

Twist angle:

80° (FX10/FX10RT/FX10RTR/
FX10RTRA)
70° (FX10MT/FX10MTR/FX10MTRA)

T

 

R

.

.

Spring seat nut:

23 Nm (2.3 m · kg, 17 ft · lb)

4-15

POWR

TR

SECONDARY SHEAVE

2. Measure:

• Secondary sheave clearance 

a 

Out of specification 

→ Adjust.

3. Calculate:

• Shim thickness

NOTE:

For example, if the clearance is 36 mm (1.42 in),
install a 0.5 mm (0.02 in) shim on each bolt so the
clearance is 35.5 mm (1.40 in).

4. Adjust:

• Secondary sheave clearance

Secondary sheave clearance:

35.0 ~ 35.8 mm (1.38 ~ 1.41 in)

Adjustment steps:

• Disassemble the secondary sheave.
• Remove the bolts and original shims 1.
• Install new shims of the proper thickness and

reassemble the secondary sheave.

• Measure the secondary sheave clearance

again.
Repeat these steps until the clearance is within
specification.

NOTE:

Yamaha recommends keeping the original shims.

Shims:

Part number

Thickness

90201-061H1

0.5 mm (0.02 in)

90201-06037

1.0 mm (0.04 in)

4-16

POWR

TR

SECONDARY SHEAVE

INSTALLATION

1. Lubricate:

• Splines (fixed sheave)

2. Tighten:

• Secondary sheave bolt

3. Adjust:

• V-belt position

Refer to “DRIVE V-BELT” in CHAPTER 2.

• Sheave offset
• Secondary sheave free play (clearance)

Refer to “SHEAVE OFFSET ADJUSTMENT”
in CHAPTER 2.

Recommended grease:

ESSO beacon 325 grease or 
Aeroshell grease #7A

T

 

R

.

.

Secondary sheave bolt:

64 Nm (6.4 m · kg, 46 ft · lb)