Yamaha YFM250XN 2001 Supplementary Service Manual page 50

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5.Spark plug cap resistance
Remove the spark plug cap.
Connect the pocket tester (Ω × 1 k) to the
spark plug cap.
Check that the spark plug cap has the
specified resistance.
Spark plug cap resistance:
10 kΩ at 20 ˚C (68˚F)
6.Ignition coil resistance
Disconnect the ignition coil connector from
the wire harness.
Connect the pocket tester (Ω × 1) to the
ignition coil.
Check that the primary coil has the speci-
fied resistance.
Primary coil resistance:
0.18 ~ 0.28 Ω at 20 ˚C (68˚F)
Connect the pocket tester (Ω × 1 k) to the
ignition coil.
*
MEETS
SPECIFICATION
IGNITION SYSTEM
OUT OF SPECIFICATION
Replace the spark plug cap.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Ignition coil base
Tester (+) lead → Ignition coil base
Tester (–) lead → Spark plug lead
– 43 –
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