Yamaha WR250F Owner's Service Manual

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Contents

TROUBLESHOOTING10-3Fuel system1. Throttle body• Damaged or loose throttle body joint2. Air filter• Clogged air filter elementChassis1. Brake(s)• Dragging brakeElectrical system1. Spark plug• Incorrect spark plug gap• Incorrect spark plug heat range2. Ignition system• Faulty ECU• Faulty coolant temperature sensorEAS2GB2418OVERCOOLINGCooling system1. Coolant temperature sensor• Faulty coolant temperature sensorEAS2GB2419POOR BRAKING PERFORMANCEChassis1. Brake(s)• Worn brake pad• Worn brake disc• Air in hydraulic brake system• Leaking brake fluid• Defective master cylinder kit• Faulty brake caliper kit• Faulty brake caliper seal• Loose union bolt• Damaged brake hose• Oil or grease on the brake disc• Oil or grease on the brake pad• Incorrect brake fluid levelEAS2GB2420FRONT FORK OIL LEAKINGChassis1. Front fork• Bent, damaged, or rusty inner tube• Cracked or damaged outer tube• Improperly installed oil seal• Damaged oil seal lip• Incorrect oil level (high)• Loose damper rod assembly bolt• Damaged damper rod assembly bolt copperwasher• Cracked or damaged cap bolt O-ringEAS2GB2421FAULTY FRONT FORK LEGSChassis1. Front fork• Bent or damaged inner tube• Bent or damaged outer tube• Broken fork spring• Bent or damaged damper rod• Incorrect oil viscosity• Incorrect oil levelEAS2GB2422UNSTABLE HANDLINGChassis1. Handlebar• Bent or improperly installed handlebar2. Steering head components• Improperly installed upper bracket• Improperly installed lower bracket(improperly tightened ring nut)• Bent steering stem• Damaged ball bearing or bearing race3. Front fork leg (s)• Uneven oil levels (both front fork legs)• Unevenly tensioned fork spring (both frontfork legs)• Broken fork spring• Bent or damaged inner tube• Bent or damaged outer tube4. Swingarm• Worn bearing or bushing• Bent or damaged swingarm5. Rear shock absorber assembly (-ies)• Faulty rear shock absorber spring• Leaking oil or gas6. Tire (s)• Uneven tire pressures (front and rear)• Incorrect tire pressure• Uneven tire wear7. Wheel (s)• Incorrect wheel balance• Broken or loose spoke• Damaged wheel bearing• Bent or loose wheel axle• Excessive wheel runout8. Frame• Bent frame• Damaged steering head pipe• Improperly installed bearing race