Yamaha YFM400FAR Service Manual page 320

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8.Main switch
Refer to "CHECKING THE SWITCHES".
9.Pickup coil resistance
Disconnect the AC magneto coupler from
G
the wire harness.
Connect the pocket tester (Ω × 100) to the
G
pickup coil terminals.
Tester (+) lead → White/Red terminal 1
Tester (–) lead → White/Green terminal 2
Check the pickup coil for the specified
G
resistance.
Pickup coil resistance:
459 ~ 561 Ω at 20 °C (68 °F)
(White/Red – White/Green)
10.Charging/rotor rotation direction detection
coil resistance
Disconnect the AC magneto coupler from
G
the wire harness.
Connect the pocket tester (Ω × 100) to the
G
charging/rotor rotation direction detection
coil terminal.
Tester (+) lead → Red terminal 1
Tester (–) lead → White/Blue terminal 2
Check the charging/rotor rotation direction
G
detection coil for the specified resistance.
Rotor rotation direction sensing
coil resistance:
0.085 ~ 0.105 Ω at 20 °C (68 °F)
(Red – White/Blue)
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C0NTINUITY
CORRECT
MEETS
SPECIFICATION
MEETS
SPECIFICATION
9 - 13
IGNITION SYSTEM
INCORRECT
Replace the main switch.
OUT OF SPECIFICATION
Replace the pickup coil/stator assembly.
OUT OF SPECIFICATION
Replace the pickup coil/stator assembly.
– +
ELEC