Yamaha WR250FM Ignition Coil Inspection, Resistance Position 08 ~ 0.10 Ω at 20 C 68 F

IGNITION SYSTEM

ELEC

–+

EC626002

IGNITION COIL INSPECTION

1.Remove the ignition coil cap.

2.Inspect:

•Primary coil resistance

Out of specification → Replace.

Tester (+) lead → Orange lead 1

Tester (–) lead → Black lead 2

Primary coil	Tester selector
resistance	position
0.08 ~ 0.10 Ω at	Ω ⋅ 1
20 °C (68 °F)

3.Inspect:

•Secondary coil resistance

Out of specification → Replace.

Tester (+) lead → Orange lead 1

Tester (–) lead → Spark plug terminal 2

Secondary coil	Tester selector
resistance	position
4.6 ~ 6.8 kΩ at	kΩ ⋅ 1
20 °C (68 °F)

4.Inspect:

•Sealed portion of ignition coil a

•Spark plug terminal pin b

•Threaded portion of spark plug c Wear → Replace.

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