Yamaha WR250F Manuel D'atelier page 614

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6 - 5
IGNITION SYSTEM
EC626002
IGNITION COIL INSPECTION
1. Inspect:
Primary coil resistance
Out of specification → Replace.
Tester (+) lead → Orange lead 1
Tester (–) lead → Black lead 2
Primary coil
resistance
0.20 ~ 0.30 Ω at
20 ˚C (68 ˚F)
2. Inspect:
Secondary coil resistance
Out of specification → Replace.
Tester (+) lead → Spark plug lead 1
Tester (–) lead → Orange lead 2
Secondary coil
resistance
9.5 ~ 14.3 kΩ at
20 ˚C (68 ˚F)
NOTE:
When inspecting the secondary coil resis-
tance, remove the spark plug cap.
CDI MAGNETO INSPECTION
1. Inspect:
Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead 1
Tester (–) lead → White lead 2
Pickup coil
resistance
248 ~ 372 Ω at
20 ˚C (68 ˚F)
– +
ELEC
Tester selector
position
Ω × 1
Tester selector
position
kΩ × 1
Tester selector
position
Ω × 100