Yamaha PZ50W Service Manual page 25

COOLING SYSTEM/VALVE CLEARANCE ADJUSTMENT
1
2
b
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 a.
• 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 b.
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.
2-7
INSP
ADJ