2006 YAMAHA YZ450F engine

[x] Cancel search: engine

Page 238 of 650

YAMAHA YZ450F 2006  Owners Manual 3 - 46
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 240 of 650

YAMAHA YZ450F 2006  Owners Manual 3 - 47
INSP
ADJ
IGNITION TIMING CHECK
IGNITION TIMING CHECK
1. Remove:
Timing plug 1 
2. Attach:
Timing light 
Inductive tachometer
To the ignition coil lead 
(orange lead 1).
Timing light:
YM-3327

Page 242 of 650

YAMAHA YZ450F 2006  Owners 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 Number plate removal
Extent of removal Order Part name

Page 254 of 650

YAMAHA YZ450F 2006  Owners Manual 4 - 7
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 264 of 650

YAMAHA YZ450F 2006  Owners Manual 4 - 12
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

Page 284 of 650

YAMAHA YZ450F 2006  Owners Manual 4 - 22
ENGCAMSHAFTS
CAMSHAFTS
CYLINDER HEAD COVER
Extent of removal:
1 Cylinder head cover removal
Extent of removal Order Part name Q’ty Remarks
Preparation for removalCYLINDER HEAD COVER 
REMOVAL

Page 294 of 650

YAMAHA YZ450F 2006  Owners Manual 4 - 27
ENGCAMSHAFTS
Decompression system
1. Check:
Decompression system
Checking steps:
Check that the decompressor cam 1
moves smoothly.
Check that the decompressor lever pin 2
projects from the c

Page 324 of 650

YAMAHA YZ450F 2006  Owners Manual 4 - 42
ENGVALVES AND VALVE SPRINGS
5. Install:
Adjusting pad 1 
Valve lifter 2 
NOTE:
Apply the engine oil on the valve lifters.
Apply the molybdenum disulfide oil on the
valve stem end.
Valve li