Yamaha YFM450FAR Service Manual page 331

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6.Ignition coil resistance
Disconnect the ignition coil connector from
G
the wire harness.
Connect the pocket tester (Ω × 1) to the
G
ignition coil.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Ignition coil base
Check that the primary coil has the
G
specified resistance.
Primary coil resistance:
0.18 ~ 0.28 Ω at 20 °C (68 °F)
Connect the pocket tester (Ω × 1k) to the
G
ignition coil.
Tester (+) lead → Orange lead terminal
Tester (–) lead → Spark plug lead
Check that the secondary coil has the
G
specified resistance.
Secondary coil resistance:
6.32 ~ 9.48 kΩ at 20 °C (68 °F)
7.Engine stop switch
Refer to "CHECKING THE SWITCH".
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9 - 12
IGNITION SYSTEM
OUT OF SPECIFICATION
Replace the ignition coil.
INCORRECT
Replace the handlebar switch (left).
– +
ELEC