Yamaha PZ50RTZ Owner's Manual page 66

Periodic maintenance and adjustment
When the engine has cooled, place a thick
rag or towel over the coolant reservoir
cap, and slowly rotate the cap counter-
clockwise to the detent. This procedure al-
lows any residual pressure to escape.
When the hissing sound has stopped,
press down on the cap while turning coun-
terclockwise and remove it.
To check the coolant level
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Remove the
PZ50GT / PZ50MT) or open the shroud
(PZ50VT), and then remove the right up-
per cover. (See page 48 for removal pro-
cedures.)
3. Check the coolant level in the coolant
reservoir when the engine is cold. If the
coolant level is below the "COLD LEVEL"
mark, add coolant until it reaches the
"COLD LEVEL" mark. (See the following
section "Replenishing the coolant" for
more details.) NOTICE: If coolant is not
available, use distilled water or soft
tap water instead. Do not use hard wa-
ter or salt water since it is harmful to
the engine. If water has been used in-
stead of coolant, replace it with cool-
ant as soon as possible, otherwise the
cooling system will not be protected
against frost and corrosion. If water
has been added to the coolant, have a
Yamaha dealer check the antifreeze
content of the coolant as soon as pos-
sible, otherwise the effectiveness of
the coolant will be reduced.
60
top cover (PZ50RT /
[ECS00492]
1. "COLD LEVEL" mark
4. Install the right upper cover, and then in-
stall the top cover (PZ50RT / PZ50GT /
PZ50MT) or close the shroud (PZ50VT).
Bleeding the cooling system
The cooling system must be bled if the cool-
ant reservoir becomes empty, if air can be
seen in the cooling system, or if there is a
cooling system leak. Consult a Yamaha deal-
er.
ECS00500
NOTICE
Operating the engine with an improperly
bled cooling system can cause overheat-
ing and severe engine damage.
Replenishing the coolant
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Remove the
PZ50GT / PZ50MT) or open the shroud
(PZ50VT), and then remove the right up-
per cover. (See page 48 for removal pro-
cedures.)
3. Remove the coolant reservoir cap, add
the recommended coolant until it reaches
the "COLD LEVEL" mark, and then install
the cap.
top cover (PZ50RT /