Yamaha WR250F(N) Owner's Service Manual page 632

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LIGHTING SYSTEM
LIGHT SWITCH INSPECTION
1. Inspect:
Light switch continuity
Tester (+) lead
Tester (–) lead
OFF
No continuous while being
Continuous while being OFF
CDI MAGNETO INSPECTION
1. Inspect:
Lighting coil resistance
Out of specification
Tester (+) lead
Tester (–) lead
Lighting coil
resistance
0.16 ~ 0.24
20 ˚C (68 ˚F)
VOLTAGE REGULATOR INSPECTION
1. Start the engine.
2. Turn on the headlight and taillight by turn-
ing on the light switch.
3. Inspect:
Out-put voltage
Out of specification
regulator.
Tester (+) lead
Tester (–) lead
Out-put voltage
13.3 ~ 14.3 V at
5,000 r/min
–
ELEC
Yellow lead 1
Blue lead 2
Tester selec-
Y L
tor position
1 2
Replace.
Replace.
Replace.
Yellow lead 1
Black lead 2
Tester selector
position
at
1
Replace voltage
Blue lead 1
Black lead 2
Tester selector
position
ACV-20
+
1