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Yamaha YZ250FX 2019 User Manual

Yamaha YZ250FX 2019
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ENGINE
3-7
EAM20135
ENGINE
EAM30210
CHECKING THE COOLANT LEVEL
WARNING
EWA19070
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.
NOTICE
ECA24260
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
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.
1. Radiator
1

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Yamaha YZ250FX 2019 Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0mm x 53.6mm
Fuel SystemYamaha Fuel Injection (YFI), Keihin® 44mm
IgnitionTCI: Transistor Controlled Ignition
Final DriveChain
Front BrakeHydraulic disc, 270mm
Rear BrakeHydraulic disc, 245mm
Seat Height37.6 in
Ground Clearance12.8 in
Fuel Capacity2.1 gal
Wet Weight249 lb
Engine TypeLiquid-cooled DOHC 4-stroke
TransmissionWide-ratio 6-speed; multiplate wet clutch
Front SuspensionKYB® spring-type fork, fully adjustable
Rear SuspensionKYB® single shock
L x W x H32.5 in
Front Tire90/90-21
Rear Tire110/100-18

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