Yamaha YZ 2020 Series, Owner'S Service Manual

Page: 97 / 376

ENGINE
3-21
EAM30211
CHECKING THE COOLING SYSTEM
1. Remove:
•
Seat
• Side cover (left/right)
•
Air scoop (left/right)
Refer to “GENERAL CHASSIS” on page 4-1.
•
Air filter case cover
Refer to “THROTTLE BODY” on page 7-4.
2. Check:
• Radiator
•
Radiator hoses
Crack/damage

Replace.
Refer to “RADIATOR” on page 6-2.
3. Install:
•
Air filter case cover
Refer to “THROTTLE BODY” on page 7-4.
•
Air scoop (left/right)
• Seat
•
Side cover (left/right)
Refer to “GENERAL CHASSIS” on page 4-1.
EAM30212
CHANGING THE COOLANT
WARNING
EWA19080
If coolant seems hot, do not remove the radi-
ator cap.
1. Place a container under the engine.
2. Remove:
•
Coolant drain bolt “1”
3. Remove:
• Radiator cap
Slowly loosen the radiator cap to drain cool-
ant.
TIP
When the radiator cap is loosened, coolant will
gush out transversely; therefore, bring the con-
tainer near to the outlet.
4. Thoroughly flush the cooling system with
clean tap water.
5. Install:
• Copper washer
•
Coolant drain bolt
6. Pour coolant.
WARNING
EWA13040
• If coolant splashes in your eyes, thorough-
ly wash them with water and consult a doc-
tor.
• If coolant splashes on your clothes, quickly
wash it away with water and then with soap
and water.
• If coolant is swallowed, induce vomiting
and get immediate medical attention.
NOTICE
ECA13481
• Adding water instead of coolant lowers the
antifreeze content of the coolant. If water is
used instead of coolant, check, and if nec-
essary, correct the antifreeze concentra-
tion of the coolant.
• Use only distilled water. However, if dis-
tilled water is not available, soft water may
be used.
• If coolant comes into contact with painted
surfaces, immediately wash them with wa-
ter.
• Do not mix different types of antifreeze.
7. Install:
• Radiator cap
8. Start the engine, warm this up for several
minutes, stop it, and then wait for it to cool
down.
9. Check:
•
Coolant level
Refer to “CHECKING THE COOLANT LEV-
EL” on page 3-20.
1 1
New
Coolant drain bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Recommended coolant
High quality ethylene glycol
anti-freeze containing anti-cor-
rosion for aluminum engine
Radiator (including all routes)
0.93 L (0.98 US qt, 0.82 Imp.qt)
Coolant mixing ratio
1:1 (Coolant:Water)
T
R
.
.