engine YAMAHA WR 450F 2004 Workshop Manual

YAMAHA WR 450F 2004 Workshop Manual WR 450F 2004 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52484/w960_52484-0.png YAMAHA WR 450F 2004 Workshop Manual

Page 250 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 35
INSP
ADJ
DRIVE CHAIN SLACK ADJUSTMENT
DRIVE CHAIN SLACK ADJUSTMENT
1. Elevate the rear wheel by placing the
suitable stand under the engine.
2. Check:
Drive chain slack a 
Above the seal guard

Page 254 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 37
INSP
ADJFRONT FORK INTERNAL PRESSURE RELIEVING/
FRONT FORK REBOUND DAMPING FORCE ADJUSTMENT
FRONT FORK INTERNAL PRESSURE 
RELIEVING
NOTE:
If the front fork initial movement feels stiff dur-
ing

Page 260 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 40
INSP
ADJREAR SHOCK ABSORBER SPRING PRELOAD
ADJUSTMENT
REAR SHOCK ABSORBER SPRING 
PRELOAD ADJUSTMENT
1. Elevate the rear wheel by placing the
suitable stand under the engine.
2. Remove:
Rear f

Page 270 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 45
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
2. Inspect:
Bearing free play
Exist play → Replace.
STEERING HEAD INSPECTION AND 
ADJUSTMENT
1. Elevate the front wheel by placing a suit-
ab

Page 276 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 48
INSP
ADJ
ELECTRICAL/SPARK PLUG INSPECTION
EC370000
ELECTRICAL
EC371001
SPARK PLUG INSPECTION
1. Remove:
Spark plug
2. Inspect:
Electrode 1 
Wear/damage → Replace.
Insulator color 2 
Normal

Page 278 of 754

YAMAHA WR 450F 2004 Workshop Manual 3 - 49
INSP
ADJ
IGNITION TIMING CHECK
IGNITION TIMING CHECK
1. Remove:
Timing plug 1 
1
2. Attach:
Timing light 
Inductive tachometer 
To the ignition coil lead (orange lead
1).
Timing light:
YM-33

Page 302 of 754

YAMAHA WR 450F 2004 Workshop Manual  
4 - 1
ENG
 
EC400000 
ENGINE 
EC4R0000 
SEAT, FUEL TANK AND SIDE COVERS 
Extent of removal:  
1  
 Seat removal  
2  
 Fuel tank removal  
3  
 Side covers removal  
4  
 Headlight removal
Extent of

Page 310 of 754

YAMAHA WR 450F 2004 Workshop Manual  
4 - 5
ENG
 
RADIATOR 
EC450001 
RADIATOR 
Extent of removal: 
1 
 Radiator removal 
2 
 Coolant reservoir removal
Extent of removal Order Part name Q’ty Remarks 
RADIATOR REMOVAL 
Preparation for

Page 312 of 754

YAMAHA WR 450F 2004 Workshop Manual 4 - 6
ENGRADIATOR
EC456000
HANDLING NOTE
WARNING
Do not remove the radiator cap when the
engine and radiator are hot. Scalding hot
fluid and steam may be blown out under
pressure, which could cause se

Page 322 of 754

YAMAHA WR 450F 2004 Workshop Manual 4 - 11
ENGCARBURETOR
EC466020
HANDLING NOTE
CAUTION:
Do not loosen the screws {TPS (throttle
position sensor)} 1 except when changing
the TPS (throttle position sensor) due to
failure because it will