Engine; Checking The Coolant Level; Checking The Cooling System; Changing The Coolant - Yamaha YZ 2019 Series Owner's Service Manual

EAM20135

ENGINE

EAM30210

CHECKING THE COOLANT LEVEL

EWA19070
WARNING
If coolant seems hot, do not remove the radi-
ator cap.
1. Stand the vehicle upright on a level surface.
2. Remove:
• Radiator cap "1"
3. Check:
• Coolant level
Maximum level "a" or below  Add coolant
up to the maximum level.
1. Radiator
ECA24260
NOTICE
• Adding water instead of coolant lowers the
antifreeze content. If, therefore, water is
used instead of coolant, check, and if nec-
essary, adjust the antifreeze concentration.
• Use only distilled water. However, if dis-
tilled water is not available, soft water may
be used.
4. Start the engine, warm this up for 3 minutes,
and then stop it.
5. Check:
• Coolant level
TIP
Before checking the coolant level, wait a few
minutes until the coolant has settled.
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 7-6.
2. Check:
• Radiator
• Radiator hose
Crack/damage  Replace.
Refer to "RADIATOR" on page 6-1.
3. Install:
• Air filter case cover
Refer to "THROTTLE BODY" on page 7-6.
• Air scoop (left/right)
• Seat
• Side cover (left/right)
Refer to "GENERAL CHASSIS" on page 4-1.
EAM30212

CHANGING THE COOLANT

EWA19080
WARNING
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.
3-7
ENGINE
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