Troubleshooting; General Information; Troubleshooting Of Engine (Fault Code Not Detected) - Yamaha WR250F 2023 Owner's Manual

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TROUBLESHOOTING

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GENERAL INFORMATION

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• Troubleshooting information provided here does not cover all the trouble symptoms, possible causes,
and remedial actions. Some items may not apply depending on the model. Use this information as a
guide and quick reference matrix when performing basic troubleshooting. Refer to the each chapter
for detailed information on checking, adjustment, and replacement.
• The following guide for troubleshooting represent quick and easy procedures for checking these vital
systems yourself. However, should your motorcycle require any repair, take it to a Yamaha dealer,
whose skilled technicians have the necessary tools, experience, and know-how to service the motor-
cycle properly.
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TROUBLESHOOTING OF ENGINE (fault code not detected)

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If a fault code is detected, have a Yamaha dealer check the electrical system.
Engine does not crank.
Symptom
Starter motor does not operate
Starter motor operates, but the
engine does not crank.
Engine will not start or is difficult to start, but it cranks.
Symptom
Spark plug does not produce a
spark
Fuel not supplied
Possible cause
Have a Yamaha dealer check the electrical system.
Starter clutch malfunction
Improper oil grade (starter clutch
slipping)
Stuck piston or seized crankshaft
Possible cause
Have a Yamaha dealer check the electrical system.
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Empty fuel tank
Clogged fuel tank cap breather
hole
Clogged or damaged fuel hose
Fuel leakage
Clogged fuel pump
Cracks or damage in fuel pump
Fuel pump malfunction
Failed or clogged fuel injector
ECU failure
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TROUBLESHOOTING
Actions
Replace the starter clutch.
Change to recommended engine
oil.
Disassemble and check the
engine. Replace defective parts.
Actions
Measure the fuel pressure.
Fill the fuel tank with fuel.
Clean the fuel tank cap.
Clean, repair, or replace the fuel
hose.
Check the fuel passage. Repair or
replace as necessary.
Clean or replace the fuel pump.
Replace the fuel pump.
Have a Yamaha dealer check the
electrical system.
Replace the fuel injector.
Replace the ECU.