Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 27

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PRIMARY SHEAVE AND DRIVE V-BELT

REMOVAL

1. Remove:

• Primary sheave assembly 1 

NOTE:

Use the primary sheave holder 2 and primary
sheave puller 3.

Sheave holder:

90890-01701, YS-01880-A

Primary sheave puller:

90890-01898, YS-01881-A,
YS-01881-1

DISASSEMBLY

1. Remove:

• Fixed sheave 1 
• Stopper 2 
• Sliding sheave 3 
• Bushing 4 
• Spider 5 

Removal steps:

• Immerse the primary sheave assembly in 80 ~

100  °C (176 ~ 212 °F) water for several min-
utes.

• Attach the lower piece of the clutch spider sepa-

rator 6 onto a rigid table using suitable mount-
ing bolts.

• Then, install the clutch separator adapter 7

onto the separator.

Clutch spider separator:

90890-01711, YS-28890-C

Clutch separator adapter:

90890-01740, YS-34480

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• Fit the primary sheave assembly onto the

adapter and secure the supporting plates 8.

NOTE:

Securely fit the projections on the adapter into the
fixed sheave holes.

• Set the bar wrench 9 onto the spider and turn

the special tool clockwise to loosen the spider.

CAUTION:

• The spider has a left-handed thread.
• Since a high torque is required to loosen the

spider, make sure that the spider, fixed
sheave and special tool are well secured.
Loosen the spider carefully to prevent cracks
and damage to the sheaves and spider.

• Remove the fixed sheave, fixed sheave stop-

per, and sliding sheave from the spider.

Clutch spider separator:

90890-01711, YS-28890-C

INSPECTION

1. Inspect:

• Spider
• Sliding sheave
• Fixed sheave
• Primary sheave cap

Cracks/damage 

→ Replace.

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PRIMARY SHEAVE AND DRIVE V-BELT

2. Inspect:

• Primary sheave spring 1 

Cracks/damage 

→ Replace.

3. Measure:

• Primary sheave spring (standard) free length

a 
Out of specification 

→ Replace the primary

sheave spring.

NOTE:

When changing the primary sheave springs, refer
to “GEAR SELECTION” in CHAPTER 2.

4. Inspect:

• Primary sheave cap bush 1 
• Sliding sheave bush 2 

Cracks/damage 

→ Replace.

Primary sheave spring (standard) 
free length:

PZ50/PZ50GT/PZ50FX:

72.1 mm (2.84 in)

PZ50M:

74.1 mm (2.92 in)

PZ50VT “USA/Canada”:

73.4 mm (2.89 in)

PZ50VT “Europe”/PZ50MP:

72.9 mm (2.87 in)

Clutch bushing press:

YS-42424

5. Inspect:

• Weight 1 
• Roller 2 
• Bushing 3 
• Slider 4 
• Rivet 5 
• Collar

Wear/scratches/damage 

→ Replace.

Slider inside clearance

+

:

Min. 0 mm (0 in)
Max. 0.3 mm (0.0118 in)

A

1

A

2

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Rivet replacement steps:

• Remove old rivet with the appropriate drill.
• Insert the rivet 1 from the ID mark 2 side.
• Press or peen the rivet head so that the diame-

ter 

a of the rivet head measures 8.2 mm

(0.32 in) or larger.

6. Measure:

• Bushing inside diameter

Out of specification 

→ Replace as a set.

NOTE:

When replacing the weight and roller bushings, use
the YXR clutch bushing jig kit.

Ê Removing
Ë Installing

Bushing inside diameter:

Roller 

È:

New: 9.077 mm (0.357 in)
Wear limit: 9.3 mm (0.366 in)

Weight 

É:

New: 8.077 mm (0.318 in)
Wear limit: 8.3 mm (0.327 in)

YXR clutch bushing jig kit:

YS-39752

È

É

Ê

Ë

ASSEMBLY

1. Install:

• Sliding sheave

(onto the spider)

NOTE:

Be sure the sliding sheave match mark (X) is
aligned with the spider match mark (X).