2016 YAMAHA YZ250F coolant level

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Page 18 of 356

YAMAHA YZ250F 2016  Owners Manual DESCRIPTION
1-4
EAS1SM9009
DESCRIPTION
TIP
Designs and specifications of the vehicle are subject to change without notice. Therefore, please 
note that the descriptions in this manual may be different

Page 83 of 356

YAMAHA YZ250F 2016  Owners Manual 3
PERIODIC CHECKS AND ADJUSTMENTS
MAINTENANCE INTERVALS.......................................................................... 3-1
MAINTENANCE INTERVALS ............................................

Page 91 of 356

YAMAHA YZ250F 2016  Owners Manual PRE-OPERATION INSPECTION AND MAINTENANCE
3-7
EAS1SM9065PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating 
co

Page 92 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE
3-8
EAS1SM9067
ENGINE
EAS1SM9068CHECKING THE COOLANT LEVELEWA1DX1003
WARNING
If coolant seems hot, do not remove the ra-
diator cap.
1. Stand the vehicle upright on a level surface.
2. Remove:

Page 93 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE
3-9
5. Install:
• Copper washer 
• Coolant drain bolt
6. Pour coolant.
EWA13040
WARNING
• If coolant splashes in your eyes, thorough-
ly wash them with water and consult a 
doctor.
• If

Page 94 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE
3-10
EAS1SM9073CHECKING THE COOLANT CIRCULATORY 
SYSTEM FOR LEAKS
1. Check:
• Coolant level
2. Install:
• Radiator cap tester “1”
• Adapter “2”
3. Activate the tester to apply the

Page 273 of 356

YAMAHA YZ250F 2016  Owners Manual WATER PUMP
6-6
EAS1SM9298REMOVING THE OIL SEAL
TIP
• Remove the oil seal when the coolant level 
changes frequently more than usual, coolant 
has discolored, or engine oil has become 
milky.
• Do

Page 337 of 356

YAMAHA YZ250F 2016  Owners Manual TROUBLESHOOTING
9-2
3. Ignition system
• Faulty ECU
• Faulty crankshaft position sensor
• Broken generator rotor woodruff key
EAS1SM9352POOR MEDIUM-AND-HIGH-SPEED PER-
FORMANCE
Refer to “START
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