2006 YAMAHA WR 250F oil

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Page 814 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 51
–+ELECCHARGING SYSTEM
EC624000COUPLERS AND LEADS 
CONNECTION INSPECTION
1. Check:
•Couplers and leads connec-
tion
Rust/dust/looseness/short-cir-
cuit 
→ Repair or replace.
CHARGING VOLTA

Page 816 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 53
–+ELECTHROTTLE POSITION SENSOR SYSTEM
THROTTLE POSITION SENSOR SYSTEM
INSPECTION STEPS
If the throttle position sensor will not operate, use the following inspection steps.
NOTE:Use the follo

Page 822 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 59
–+ELECTHROTTLE POSITION SENSOR SYSTEM
HANDLING NOTE
CAUTION:
Do not loosen the screws (throttle
position sensor) 1
 except when
changing the throttle position sen-
sor due to failure because

Page 824 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 61
–+ELECTHROTTLE POSITION SENSOR SYSTEM
3. Inspect:
•Throttle position sensor coil
variable resistance
Check that the resistance in
increased as the throttle grip is
moved from the full close

Page 830 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 67
–+ELECLIGHTING 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 836 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 6 - 73
–+ELECLIGHTING SYSTEM
AC MAGNETO INSPECTION
1. Inspect:
•Lighting coil resistance
Out of specification 
→ 
Replace.
Tester (+) lead →
 Yellow lead 1
 
Tester (–) lead →
 Ground 2

Page 874 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 7 - 25
TUNSETTING
EC722011Front fork setting
The front fork setting should be made
depending on the rider’s feeling of an
actual run and the circuit conditions.
The front fork setting includes the f

Page 876 of 900

YAMAHA WR 250F 2006  Manuale duso (in Italian) 7 - 27
TUNSETTING
ÈAir spring characteristics in relation to 
oil level change
ÉLoad
ÊStroke 
1Max. oil level
2Standard oil level
3Min. oil level
EC727020Spring preload adjustment
The spring preloa