Yamaha YFM250XL(C) Service Manual page 281

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7.Pickup coil resistance
Disconnect the CDI magneto coupler
from the wire harness.
Connect the pocket tester (Ω × 100) to
the pickup coil terminal.
Tester (+) lead → White/Green terminal 1
Tester (–) lead → White/Red terminal 2
Check the pickup coil for the specified
resistance.
Pickup coil resistance:
189~ 231 Ω at 20˚C (68˚F)
(White/Green – White/Red)
8.Source coil resistance
Disconnect the source coil coupler from
the wire harness.
Connect the pocket tester (Ω × 100) to
the source coil terminal.
Tester (+) lead → Brown terminal 1
Tester (–) lead → Black terminal 2
Check the source coil for the specified
resistance.
Source coil resistance:
270 ~ 330 Ω at 20˚C (68˚F)
(Brown – Black)
9.Wiring connection
Check the connections of the entire igni-
tion system.
Refer to "CIRCUIT DIAGRAM".
Replace the CDI unit.
C0NTINUITY
MEETS
SPECIFICATION
MEETS
SPECIFICATION
CORRECT
8 - 11
IGNITION SYSTEM
OUT OF SPECIFICATION
Replace the pickup coil.
OUT OF SPECIFICATION
Replace the source coil.
POOR CONNECTION
Properly connect the ignition system.
– +
ELEC
1
Br W/G
B W/R
2
1
Br W/G
B W/R
2
8