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9-30
9
3. If the coolant is at or below the minimum level
mark, remove panels A and C to access the
coolant reservoir. (See page 9-9.)
4. Remove the coolant reservoir cap, add cool- ant or distilled water to the maximum level
mark, install the reservoir cap, and then install
the panels. NOTICE: If coolant is not avail-
able, use distilled water or soft tap water
instead. Do not use hard water or salt wa-
ter since they are harmful to the engine. If
water has been used instead of coolant,
replace it with coolant 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 con-
tent of the coolant as soon as possible,
otherwise the effectiveness of the coolant
will be reduced.
[ECB01012]
TIP The radiator fan is automatically switched on or
off according to the coolant temperature in the
radiator.
If the engine overheats, see page 9-67 for fur-
ther instructions. 1. Coolant reservoir capCoolant reservoir capacity (up to the maxi-
mum level mark):
0.24 L (0.25 US qt, 0.21 Imp.qt)
1
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9-31
9
EBU34213To change the coolant
WARNING
EWB01891Wait for the engine and radiator to cool before
removing the radiator cap. You could be
burned by hot fluid and steam blown out under
pressure. Always place a thick rag over the cap
when opening. Allow any remaining pressure
to escape before completely removing the cap. 1. Park the ATV on a level surface.
2. Remove panels A, B, C, and D. (See page9-9.)
3. Remove the footboard by removing the bolts and nuts. 4. Remove the radiator cap.
1. Footboard
2. Bolt and nut
3. Bolt
3
2
2
3
1
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9-32
9
5. Place a container under the engine, and then
remove the coolant drain bolt and its gasket.
(Use a trough or a similar object as shown to
prevent coolant from spilling on the engine
guard.)
1. Radiator cap
1
1. Coolant drain bolt
2. Gasket
1. Trough
1
2
1
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9-33
96. Place a container under the coolant reservoir
to collect the used coolant.
7. Remove the coolant reservoir cap.
8. Disconnect the coolant reservoir hose on the coolant reservoir side, and then drain the
coolant from the coolant reservoir.
9. After draining the coolant, thoroughly flush the cooling system with clean tap water.
10. Install the coolant drain bolt and its new gas- ket, and then tighten the bolt to the specified
torque. 11. Connect the coolant reservoir hose.
12. Pour the recommended coolant into the radi-
ator until it is full.
13. Pour the recommended coolant into the res- ervoir to the maximum level mark, and then
install the reservoir cap.
14. Loosen the water pump air bleed bolt, with- out removing it, to allow all of the air to es-
cape from the air bleed bolt hole.
1. Coolant reservoir hose
Tightening torque:Coolant drain bolt:10 N·m (1.0 kgf·m, 7.4 lb·ft)1. Water pump air bleed bolt
1
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9-34
9
15. When coolant begins to flow out of the bolt
hole, tighten the water pump air bleed bolt to
the specified torque.
16. Remove panel E. (See page 9-9.)
17. Loosen the clamp screw, and then remove the V-belt cooling duct. 18. Loosen the cylinder head air bleed bolt, with-
out removing it, to allow all of the air to es-
cape from the air bleed bolt hole.
19. When coolant begins to flow out of the bolt hole, tighten the cylinder head air bleed bolt
to the specified torque.
20. Start the engine and let it idle for ten minutes.
21. Rev the engine five times.
Tightening torque:
Water pump air bleed bolt:10 N·m (1.0 kgf·m, 7.4 lb·ft)
1. V-belt cooling duct
2. Clamp screw
1
2
1. Cylinder head air bleed boltTightening torque: Cylinder head air bleed boltW10 N
Page 130 of 174
9-35
922. Pour additional coolant into the radiator until
it is full.
23. Stop the engine and allow it to cool. If the coolant level has dropped after the engine
has cooled, add sufficient coolant until it
reaches the top of the radiator, and then in-
stall the radiator cap.
24. Start the engine, and then check for coolant leakage.
TIPIf any leakage is found, have a Yamaha dealer
check the cooling system. 25. Install the V-belt cooling duct, and then tight-en the clamp screw.
26. Install the footboard by installing the bolts and nuts, and then tighten them to the speci-
fied torques.
TIPTighten footboard bolts B in the order shown. 1. Footboard nut
2. Footboard bolt A
3. Footboard bolt B
3
1
2
1
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Page 162 of 174
9-67
9Engine overheating
WARNING
EWB02291Wait for the engine and radiator to cool before removing the radiator cap. You could be burned by
hot fluid and steam blown out under pressure. Always put a thick rag over the cap when opening.
Allow any remaining pressure to escape before completely removing the cap. TIP
Tap water can be used in an emergency. Change to the recommended coolant as soon as possible.
The engine will tend to overheat if the radiator is caked with mud, or if the ATV is overloaded. Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer check
and repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is
no leakage.
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11-3
11
Quantity:0.21 L (0.23 US qt, 0.19 Imp.qt)Coolant quantity:Radiator (including all routes):
1.99 L (2.10 US qt, 1.75 Imp.qt)
Coolant reservoir (up to the maximum level mark): 0.24 L (0.25 US qt, 0.21 Imp.qt)Fuel:Recommended fuel:
Regular unleaded gasoline (Gasohol [E10] acceptable)
Minimum research octane: 91
Fuel tank capacity: 18 L (4.8 US gal, 4.0 Imp.gal)
Fuel reserve amount:
4.0 L (1.06 US gal, 0.88 Imp.gal)Throttle body:ID mark:B4F1Front tire:Size:AT25 x 8-12
Manufacturer/model: MAXXIS/MU19Rear tire:Size:AT25 x 10-12
Manufacturer/model: MAXXIS/MU20
Front brake:Type:Hydraulic disc brakeRear brake:Type:Mechanical wet multiple disc brakeFront suspension:Type:
Double wishboneRear suspension:Type:Double wishboneElectrical system:System voltage:12 VBattery:Model:
YTX20L-BS
Voltage, capacity: 12 V, 18.0 AhLights:Headlight:
T19L, 30.0 W/30.0 W
Handlebar-mounted light: T15H, 35.0 W/36.5 W (YFM700FWBD)
Brake/tail light: 21.0 W/5.0 W
UB5K64E0.book Page 3 Thursday, September 16, 2021 9:00 AM