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Periodic maintenance and adjustment
86
TIP
If you find any leaks, consult a Yamaha deal-
er.
7. Check the coolant level in the coolant
reservoir. If it is not full, remove the cool-
ant reservoir cap, fill the reservoir with the
recommended coolant, and then install
the cap.
8. Install the top cover.
RST90 / RST90GT
To check the coolant level
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Remove the shroud and the right side
cover (RST90GT), or open the shroud
(RST90). [See page 63 (RST90GT) or
page 67 (RST90) for the procedures.]
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.
[ECS00492]
RST90
RST90GT
4. Install the right side cover and the shroud
(RST90GT), or close the shroud
(RST90).
Bleeding the cooling system
The cooling system must be bled if the cool-
ant reservoir becomes empty, if air can be
seen in the coolant reservoir, or if there is a
cooling system leak. Consult a Yamaha deal-
er.
NOTICE
ECS00500
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.
1. “COLD LEVEL” mark
1. “COLD LEVEL” mark
1
U8JA11E0.book Page 86 Monday, June 14, 2010 10:22 AM