Yamaha FX10B Owner's Manual page 70

Periodic maintenance and adjustment
1. Radiator cap
To check the coolant level
1. Place the snowmobile on a level surface
and apply the parking brake.
2. Check the coolant level in the coolant
reservoir when the engine is cold. If the
coolant level is below the "LOW" mark,
add coolant until it reaches the "FULL"
mark. (See the following section "Replen-
ishing the coolant" for more details.)
NOTICE: If coolant is not available,
use distilled water or soft tap water in-
stead. Do not use hard water or salt
water since it is harmful to the engine.
If water has been used instead of cool-
ant, replace it with coolant as soon as
possible, otherwise the cooling sys-
tem will not be protected against frost
and corrosion. If water has been add-
ed to the coolant, have a Yamaha deal-
er check the antifreeze content of the
coolant as soon as possible, other-
wise the effectiveness of the coolant
will be reduced.
64
[ECS00492]
1. "FULL" mark
2. "LOW" mark
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 shroud. (See page 52 for re-
moval procedures.)
3. Remove the coolant reservoir cap and
add coolant until it reaches the "FULL"
mark.
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