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Periodic maintenance and adjustment
85
RST90PGT
RS90P / RS90PLT
To check the coolant level
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Remove the top cover and the right side
cover. (See page 63 for removal proce-
dures.)
3. Check the coolant level in the coolant re-
covery tank 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]
4. Install the top cover and the right side
cover.
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.
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.
2. Remove the top cover and the right side
cover. (See page 63 for removal proce-
dures.)
3. Remove the coolant reservoir cap, fill the
reservoir with the recommended coolant,
and then install the cap.
1. Coolant reservoir cap
1
1. Coolant recovery tank
2. “COLD LEVEL” mark
1
2
1
2
U8HV10E0.book Page 85 Monday, May 16, 2011 1:15 PM