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Periodic maintenance and adjustment
86
4. Remove the coolant recovery tank cap,
add the recommended coolant until it
reaches the “COLD LEVEL” mark, and
then install the cap.
5. Start the engine, allow it to idle for several
minutes, and then turn it off.
6. Check for any coolant leakage. If coolant
is leaking, check for the cause.
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 and the right side
cover.
RST90 / RST90PGT
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 (RST90PGT), or open the shroud
(RST90). [See page 63 (RST90PGT) 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]
1. Coolant reservoir cap
2. Coolant recovery tank cap
Recommended antifreeze:
High-quality ethylene glycol antifreeze
containing corrosion inhibitors
Antifreeze and water mixing ratio:
3:2
Total amount:
RS90P 5.60 L (5.92 US qt,
4.93 Imp.qt)
RS90PLT 6.10 L (6.45 US qt,
5.37 Imp.qt)
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U8HV10E0.book Page 86 Monday, May 16, 2011 1:15 PM