2005 YAMAHA WR 250F start swit

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Page 750 of 864

YAMAHA WR 250F 2005  Owners Manual 6 - 13
–+ELECIGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the ignition coil from
spark plug.
2. Remove the ignition coil cap.
3. Connect the dynamic spark
tester 
1 (ignition checker 
2) as
shown.


Page 758 of 864

YAMAHA WR 250F 2005  Owners Manual 6 - 21
–+ELECELECTRIC STARTING SYSTEM
ELECTRIC STARTING 
SYSTEM
STARTING CIRCUIT CUT-OFF 
SYSTEM OPERATION
If the main switch is set to “ON”, the
starter motor can only operate if at
least one o

Page 760 of 864

YAMAHA WR 250F 2005  Owners Manual 6 - 23
–+ELECELECTRIC STARTING SYSTEM
INSPECTION STEPS
If the starter motor will not operate, use the following inspection steps.
*1 marked: Refer to “FUSE INSPECTION” section in the CHAPTER 3.

Page 768 of 864

YAMAHA WR 250F 2005  Owners Manual 6 - 31
–+ELECELECTRIC STARTING SYSTEM
STARTER RELAY INSPECTION
1. Remove:
Starter relay
2. Inspect:
Starter relay conduct
Use 12 V battery.
Continuous while not connected to
the battery 
→ Repla

Page 770 of 864

YAMAHA WR 250F 2005  Owners Manual 6 - 33
–+ELECELECTRIC STARTING SYSTEM
DIODE INSPECTION
1. Remove the diode from wire har-
ness.
2. Inspect:
Diode continuity
Use pocket tester 
(tester selection position 
Ω 
× 1) 
Incorrect con

Page 810 of 864

YAMAHA WR 250F 2005  Owners Manual 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
 
Li
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