check engine YAMAHA WR 250F 2002 Owner's Manual

YAMAHA WR 250F 2002 Owner's Manual WR 250F 2002 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52338/w960_52338-0.png YAMAHA WR 250F 2002 Owner's Manual

Page 460 of 694

YAMAHA WR 250F 2002 Owners Manual 4 - 96
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 470 of 694

YAMAHA WR 250F 2002 Owners Manual 4 - 101
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 612 of 694

YAMAHA WR 250F 2002 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

Page 616 of 694

YAMAHA WR 250F 2002 Owners Manual  
6 - 4
–+ELEC
 
IGNITION SYSTEM 
SPARK GAP TEST 
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester  
1  
(ignition checker  
2  
) as shown. 
 
Spark plug cap

Page 622 of 694

YAMAHA WR 250F 2002 Owners Manual –+ELEC
6 - 7
THROTTLE POSITION SENSOR SYSTEM
THROTTLE POSITION SENSOR SYSTEM
INSPECTION STEPS
If the throttle position sensor will not operate, use the following inspection steps.
*marked: Refer to

Page 626 of 694

YAMAHA WR 250F 2002 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 it

Page 634 of 694

YAMAHA WR 250F 2002 Owners Manual –+ELEC
6 - 12
LIGHTING SYSTEM
LIGHTING SYSTEM
INSPECTION STEPS
Refer to the following flow chart when inspecting the ignition system for possible problems.
NOTE:
Replace the bulb and/or bulb socket

Page 640 of 694

YAMAHA WR 250F 2002 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

Page 642 of 694

YAMAHA WR 250F 2002 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 han

Page 660 of 694

YAMAHA WR 250F 2002 Owners Manual 7 - 11
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.
Page:   < prev 1-10 11-20 21-30