2007 YAMAHA YZ450F check engine light

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Page 172 of 650

YAMAHA YZ450F 2007  Owners Manual 3 - 14
INSP
ADJ
ENGINE OIL LEVEL INSPECTION
4. Inspect:
Oil level
Check that the engine oil is above the
level mark a and that the oil does not
come out when the check bolt 1 is
removed.
Below the le

Page 178 of 650

YAMAHA YZ450F 2007  Owners Manual 3 - 17
INSP
ADJ
PILOT SCREW ADJUSTMENT
7. Install:
Oil filler cap
8. Inspect:
Engine (for oil leaks)
Oil level
Refer to “ENGINE OIL LEVEL INSPEC-
TION”.
9. Check:
Oil pressure
Checking steps:

Page 238 of 650

YAMAHA YZ450F 2007  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 2007  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 294 of 650

YAMAHA YZ450F 2007  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 418 of 650

YAMAHA YZ450F 2007  Owners Manual 4 - 89
ENGCRANKCASE AND CRANKSHAFT
REMOVAL POINTS
Crankcase
1. Separate:
Crankcase (right)
Crankcase (left)
Separation steps:
Remove the crankcase bolts, hose guide
and clutch cable holder.
NOTE:
L

Page 428 of 650

YAMAHA YZ450F 2007  Owners Manual 4 - 94
ENGCRANKCASE AND CRANKSHAFT
5. Install:
Dowel pin 1 
O-ring 2
Crankcase (right)
To crankcase (left).
NOTE:
Apply the lithium soap base grease on the O-
ring.
Fit the crankcase (right) onto

Page 604 of 650

YAMAHA YZ450F 2007  Owners Manual 7 - 2
TUN
CAUTION:
The carburetor is extremely sensitive to
foreign matter (dirt, sand, water, etc.).
During installation, do not allow foreign
matter to get into the carburetor.
Always handle the c