Overheating; Overcooling; Poor Braking Performance; Faulty Front Fork Legs - Yamaha WR450FB 2012 Owner's Service Manual

EAS28590
OVERHEATING
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1. Cylindertiead·a:nc:f
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• Heavy carbon buildup ,,. . .
•Clogged coolant passage·s-=to ·:
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2. Engine oil
• Incorrect oil level ': ·: :1::; 7t: ,-:-::..
• Incorrect oil vis€osity.; : ~ .. L;:::.q ~~:
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Cooling system
1.
Coolant
• Low coolant level
2. Radiator
•Damaged or leaking radiator_. ·.)
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•Faulty radiator cap
• Bent or damaged radiator fin
3. Water pump
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•Damaged or faulty water pump " ,-. ,.
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• Thermostat stays closed
• Damaged hose
• Improperly connected hose
• Damaged pipe
• Improperly connected pipe
Fuel system · _. . ,
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1. Throttle body .... : . , _ _ ;
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•Damaged or loose
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2. Air filter ·
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•Clogged air filter element_ ...
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Chassis
1. Brake(s)
• Dragging brake
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Spark plug
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• Incorrect spark plug gap
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•Incorrect spark
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2. Ignition system bm
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• Faulty ECU
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EAS286t0
OVERCOOLING
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Cooling system • ::·
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• Faulty coolant temperature sensor
TROUBLESHOOTING
EAS26620 .....
POOR BRAKING PERFORMANCE ·
• 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·
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• Oil or grease on the b'.rakeh:il~c ·; · .. :
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• Incorrect brake fluid level - : ·
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EAS28660 ".
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10~3
FAULTY FRONT FORK LEGS , ...
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• Bent, damaged or rusty inner tube
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• Loose damper rod assembly bolt
• Damaged damper rod assembly bolt
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•Cracked or damaaed cap
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Malfunction
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• Bent or damaged inner tube _ .
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•Bent or damaged outer tube .
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• Dama ed forks rin
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•Bent or damaged da?J8er rqd:
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• Incorrect oil viscositY
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• Incorrect oil level
EAS26690
UNSTABLE
HANDLINJG_...'..l~
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1. Handlebar
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•Improperly installed lower bracket
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• Bent steering stem
• Damaged ball bearing or bearingfraee
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3. Front fork leg (s) Hsriz Hirla ine8 "
• Uneven oil levels
~both
f[ont fork legsJ
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•Unevenly
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• Broken fork spring _
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•Bent or damaged inrfer"llitie >ho1
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• Bent or damaged outer tube