check engine YAMAHA YZ250F 2005 Owner's Manual

YAMAHA YZ250F 2005 Owner's Manual YZ250F 2005 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/53958/w960_53958-0.png YAMAHA YZ250F 2005 Owner's Manual

Page 306 of 668

YAMAHA YZ250F 2005 Owners Manual 4 - 26
ENGCAMSHAFTS
Decompression system
1. Check:
Decompression system
Timing chain tensioner
1. Check:
While pressing the tensioner rod lightly
with fingers, use a thin screwdriver 1
and wind the

Page 434 of 668

YAMAHA YZ250F 2005 Owners Manual 4 - 90
ENGCRANKCASE AND CRANKSHAFT
REMOVAL POINTS
Crankcase
1. Separate:
Right crankcase
Left crankcase
Separation steps:
Remove the crankcase bolts 1, hose
guide 2 and clutch cable holder 3.
NOTE:

Page 444 of 668

YAMAHA YZ250F 2005 Owners Manual 4 - 95
ENGCRANKCASE AND CRANKSHAFT
6. Tighten:
Hose guide 1 
Clutch cable holder 2 
Bolt (crankcase) 3 
NOTE:
Tighten the crankcase tightening bolts in
stage, using a crisscross pattern.
T R..12 Nm

Page 454 of 668

YAMAHA YZ250F 2005 Owners Manual 4 - 100
ENGTRANSMISSION, SHIFT CAM AND SHIFT FORK
5. Install:
Shift fork 1 (L) 1 
Shift fork 2 (C) 2 
Shift fork 3 (R) 3 
Shift cam 4 
To main axle and drive axle.
NOTE:
Apply the molybdenum disu

Page 596 of 668

YAMAHA YZ250F 2005 Owners Manual –+ELEC
6 - 3
IGNITION SYSTEM
EC620000
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to
ignition system failure

Page 600 of 668

YAMAHA YZ250F 2005 Owners Manual 6 - 4
–+ELECIGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the spark plug cap from spark
plug.
2. Remove the ignition coil cap.
3. Connect the dynamic spark tester 1 (igni-
tion checker 2) as shown.


Page 610 of 668

YAMAHA YZ250F 2005 Owners Manual 6 - 8
–+ELECTHROTTLE POSITION SENSOR SYSTEM
HANDLING NOTE
CAUTION:
Do not loosen the screws (throttle position
sensor) 
1 except when changing the throt-
tle position sensor due to failure because i

Page 618 of 668

YAMAHA YZ250F 2005 Owners Manual 7 - 1
TUN
EC700000
TUNING
EC710000
ENGINE
Carburetor setting
The air/fuel mixture will vary depending on
atmospheric conditions. Therefore, it is nec-
essary to take into consideration the air pres-

Page 620 of 668

YAMAHA YZ250F 2005 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

Page 636 of 668

YAMAHA YZ250F 2005 Owners Manual 7 - 10
TUN
Examples of carburetor setting depending on symptom
This should be taken simply for an example. It is necessary to set the carburetor while checking
the operating conditions of the engine.
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