Overcooling; Poor Braking Performance; Faulty Front Fork Legs; Unstable Handling - Yamaha WR250R Service Manual

Clogged air filter element
G
Chassis
1. Brake (s)
Dragging brake
G
Electrical system
1. Spark plug (s)
Incorrect spark plug gap
G
Incorrect spark plug heat range
G
2. Ignition system
ECU failure
G
Faulty radiator fan motor relay
G
Faulty coolant temperature sensor
G
EAS28610

OVERCOOLING

Cooling system
1. Thermostat
Thermostat stays open
G
EAS28620

POOR BRAKING PERFORMANCE

Worn brake pad
G
Worn brake disc
G
Air in hydraulic brake system
G
Leaking brake fluid
G
Defective master cylinder kit
G
Faulty brake caliper kit
G
Faulty brake caliper seal
G
Loose union bolt
G
Damaged brake hose
G
Oil or grease on the brake disc
G
Oil or grease on the brake pad
G
Incorrect brake fluid level
G
EAS28660

FAULTY FRONT FORK LEGS

Leaking oil
Bent, damaged or rusty inner tube
G
Cracked or damaged outer tube
G
Improperly installed oil seal
G
Damaged oil seal lip
G
Incorrect oil level (high)
G
Loose damper rod assembly bolt
G
Damaged damper rod assembly bolt copper
G
washer
Cracked or damaged cap bolt O-ring
G
Malfunction
Bent or damaged inner tube
G
Bent or damaged outer tube
G
Damaged fork spring
G
Bent or damaged damper rod
G
Incorrect oil viscosity
G
Incorrect oil level
G
TROUBLESHOOTING
EAS28690

UNSTABLE HANDLING

1. Handlebar
Bent or improperly installed handlebar
G
2. Steering head components
Improperly installed upper bracket
G
Improperly installed lower bracket
G
(improperly tightened ring nut)
Bent steering stem
G
Damaged ball bearing or bearing race
G
3. Front fork leg (s)
Uneven oil levels (both front fork legs)
G
Unevenly tensioned fork spring (both front
G
fork legs)
Broken fork spring
G
Bent or damaged inner tube
G
Bent or damaged outer tube
G
4. Swingarm
Worn bearing or bushing
G
Bent or damaged swingarm
G
5. Rear shock absorber assembly (-ies)
Faulty rear shock absorber spring
G
Leaking oil or gas
G
6. Tire (s)
Uneven tire pressures (front and rear)
G
Incorrect tire pressure
G
Uneven tire wear
G
7. Wheel (s)
Incorrect wheel balance
G
Broken or loose spoke
G
Damaged wheel bearing
G
Bent or loose wheel axle
G
Excessive wheel runout
G
8. Frame
Bent frame
G
Damaged steering head pipe
G
Improperly installed bearing race
G
EAS28710

FAULTY LIGHTING OR SIGNALING SYSTEM

Headlight does not come on
Fuse open circuit
G
Wrong headlight bulb
G
Too many electrical accessories
G
Hard charging
G
Incorrect connection
G
Improperly grounded circuit
G
Poor contacts (main or light switch)
G
Burnt-out headlight bulb
G
Headlight bulb burnt out
Wrong headlight bulb
G
Faulty battery
G
Faulty rectifier/regulator
G
Improperly grounded circuit
G
9-3