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Snowmobile Yamaha Phazer PZ50W, PZ50GTW, PZ50FXW, PZ50MW, PZ50VTW, PZ50MPW. Manual - part 4

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SPARK PLUGS/FUEL LINE INSPECTION

ENGINE

SPARK PLUGS

1. Remove:

• Fuel tank

Refer to “SEAT AND FUEL TANK” in CHAP-
TER 5. (PZ50/PZ50GT/PZ50FX/PZ50M)
Refer to “RIDER SEAT AND FUEL TANK” in
CHAPTER 5. (PZ50VT/PZ50MP)

2. Remove:

• Spark plug caps
• Spark plugs

3. Inspect:

• Electrodes 1

Damage/wear

→ Replace the spark plug.

• Insulator color 2

Abnormal color

→ Replace the spark plug

Normal color is medium-to-light tan.

4. Measure:

• Spark plug gap

Out of specification

→ Regap.

Use a wire thickness gauge.

If necessary, clean the spark plugs with a spark
plug cleaner.

Standard spark plug:

NGK R CR9EKB (NGK)

Before installing a spark plug, clean the gasket sur-
face and spark plug surface.

5. Install:

• Spark plugs

NOTE:

Finger-tighten

a the spark plug before torquing b

it to specification.

Spark plug gap:

0.6 ~ 0.7 mm (0.024 ~ 0.028 in)

Spark plug:

13 Nm (1.3 m · kg, 9.4 ft · lb)

FUEL LINE INSPECTION

1. Remove:

• Headlight assembly (PZ50/PZ50GT/PZ50FX/

PZ50M)
Refer to “COWLINGS” in CHAPTER 3.

2. Inspect:

• Fuel hose 1
• Fuel return hose

Cracks/damage

→ Replace.

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COOLING SYSTEM

Coolant replacement

NOTE:

The coolant should be changed at least every sea-
son.

1. Place the machine on a level surface.
2. Remove:

• Right side panel
• Right side cover

Refer to “COWLINGS” in CHAPTER 3.

3. Remove:

• Coolant filler cap 1

WARNING

Do not remove the coolant filler cap 1 when the
engine is hot. Pressurized scalding hot fluid
and steam may be blown out, which could
cause serious injury. When the engine has
cooled, place a thick rag or a towel over the
coolant filler cap. Slowly turn the cap counter-
clockwise until it stop. This allows any residual
pressure to escape. When the hissing sound
has stopped, press down on the cap while turn-
ing it counterclockwise to remove it.

4. Place an open container under the radiator out-

let hose 1.

5. Disconnect:

• Radiator outlet hose 1 1

6. Drain the coolant.

NOTE:

Lift up the tail of the machine to drain the coolant.

WARNING

Coolant is poisonous. It is harmful or fatal if
swallowed.
• If coolant is swallowed, induce vomiting

immediately and get immediate medical atten-
tion.

• If coolant splashes in your eyes, thoroughly

wash them with water and consult a doctor.

• If coolant splashes on your skin or clothes,

quickly wash it away with soap and water.

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COOLING SYSTEM

7. Connect:

• Radiator outlet hose 1

8. Fill:

• Cooling system

CAUTION:

• Hard water or salt water is harmful to engine

parts. If soft water is not available, use boiled
or distilled water.

• Do not use water containing impurities or oil.

9. Bleed the air from the cooling system.

Recommended coolant:

High quality silicate-free ethylene
glycol antifreeze containing corro-
sion inhibitors

Coolant mixing ratio (coolant:water):

3:2 (60%:40%)

Total amount:

PZ50/PZ50GT/PZ50FX/PZ50M

3.6 L (3.17 Imp qt, 3.81 US qt)

PZ50VT/PZ50MP

3.7 L (3.26 Imp qt, 3.91 US qt)

10. Inspect:

• Cooling system

Decrease of pressure (leaks)

→ Repair as

required.

Inspection steps:

• Attach the cooling system tester 1 and adapter

2 to the coolant filler 3.

• Apply 100 kPa (1.0 kg/cm

, 14 psi).

• Measure the pressure with the gauge.

Cooling system tester:

90890-01325, YU-24460-01

Adapter:

90890-01352, YU-33984

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COOLING SYSTEM/VALVE CLEARANCE ADJUSTMENT

Air bleeding steps:

• Remove the cap 1 on the radiator outlet pipe 1.
• While slowly adding coolant to the coolant filler,

drain the coolant until no more air bubbles
appear.

• Install the cap 1.
• Add coolant to the full level

• Install the coolant filler cap.

Apply and lock the parking brake. Start the
engine and run it at approximately 1,700 ~
3,500 r/min until the coolant circulates (approxi-
mately 3 ~ 5 minutes). The heat exchanger will
be warm to the touch.

WARNING

To avoid severe injury or death:
• Make sure the machine is securely supported

with a suitable stand.

• Do not exceed 3,500 r/min. Drive line damage

and excessive V-belt wear could occur, or the
machine could unexpectedly move forward if
the clutch engages.

• Operate the engine only in a well-ventilated

area.

• Remove the coolant filler cap and bleed the

cooling system again, as described above.
No air bubbles

→ OK.

• Pour coolant into the coolant reservoir 2 until

the coolant level reaches the “COLD LEVEL”
mark

VALVE CLEARANCE ADJUSTMENT

NOTE:

• Valve clearance adjustment should be made on a

cold engine, at room temperature.

• When the valve clearance is to be measured or

adjusted, the piston must be at the top dead cen-
ter (TDC) on the compression stroke.

1. Drain:

• Engine oil

Refer to “ENGINE OIL REPLACEMENT”.

2. Remove:

• Fuel tank

Refer to “SEAT AND FUEL TANK” in CHAP-
TER 5. (PZ50/PZ50GT/PZ50FX/PZ50M)
Refer to “RIDER SEAT AND FUEL TANK” in
CHAPTER 5. (PZ50VT/PZ50MP)

• Oil tank

Refer to “A.C. MAGNETO ROTOR AND
STARTER CLUTCH” in CHAPTER 5.

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