Yamaha YZF-R1 (2006) [420/426] Troubleshooting

Yamaha YZF-R1 (2006) [420/426] Troubleshooting
TROUBLESHOOTING
9-3
Incorrect oil viscosity
Inferior oil quality
Cooling system
1. Coolant
Low coolant level
2. Radiator
Damaged or leaking radiator
Faulty radiator cap
Bent or damaged radiator fin
3. Water pump
Damaged or faulty water pump
Thermostat
Thermostat stays closed
Clogged or damaged oil cooler
Damaged hose
Improperly connected hose
Damaged pipe
Improperly connected pipe
Fuel system
1. Throttle body(-ies)
Faulty throttle body(-ies)
Damaged or loose throttle body joint
2. Air filter
Clogged air filter element
Chassis
1. Brake(s)
Dragging brake
Electrical system
1. Spark plug(s)
Incorrect spark plug gap
Incorrect spark plug heat range
2. Ignition system
Faulty ignitor unit
EAS28610
OVER COOLING
Cooling system
1. Thermostat
Thermostat stays open
EAS28620
POOR BRAKING PERFORMANCE
Worn brake pad
Worn brake disc
Air in hydraulic brake system
Leaking brake fluid
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 level
EAS28650
FAULTY FRONT FORK LEGS
Leaking oil
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 copper
washer
Cracked or damaged cap bolt O-ring
Malfunction
Bent or damaged inner tube
Bent or damaged outer tube
Damaged fork spring
Worn or damaged outer tube bushing
Bent or damaged damper rod
Incorrect oil viscosity
Incorrect oil level
EAS28680
UNSTABLE HANDLING
1. Handlebar
Bent or improperly installed right handlebar
Bent or improperly installed left handlebar
2. Steering head components
Improperly installed upper bracket
Improperly installed lower bracket
(improperly tightened ring nut)
Bent steering stem
Damaged ball bearing or bearing race
3. Front fork leg(s)
Uneven oil levels (both front fork legs)
Unevenly tensioned fork spring (both front
fork legs)
Broken fork spring
Bent or damaged inner tube
Bent or damaged outer tube
4. Swingarm
Worn bearing or bushing
Bent or damaged swingarm
5. Rear shock absorber assembly(-ies)
Faulty rear shock absorber spring
Leaking oil or gas
6. Tire(s)
Uneven tire pressures (front and rear)
Incorrect tire pressure
Uneven tire wear

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