Yamaha YFM660RN Service Manual page 291

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10.Charging/rotor rotation direction detec-
tion coil resistance
Disconnect the AC magneto coupler from
the wire harness.
Connect the pocket tester (Ω × 100) to the
charging/rotor rotation direction detection
coil terminal.
Tester (+) lead → Red terminal 1
Tester (–) lead → White/Blue terminal 2
Check the charging/rotor rotation direction
detection coil for the specified resistance.
Rotor rotation direction detec-
tion coil resistance:
0.069 ~ 0.085 Ω at 20 °C (68 °F)
(Red – White/Blue)
11.Wiring connection
Check the connections of the entire ignition
system.
Refer to "CIRCUIT DIAGRAM".
Replace the CDI unit.
C0NTINUITY
MEETS
SPECIFICATION
CORRECT
8 - 10
IGNITION SYSTEM
OUT OF SPECIFICATION
Replace the pickup coil/stator assembly.
POOR CONNECTION
Properly connect the ignition system.
– +
ELEC