Yamaha YFM250XL(C) Service Manual page 280

4.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 spec-
ified resistance.
Primary coil resistance:
0.18 ~ 0.28 Ω at 20 ˚C (68˚F)
Connect the pocket tester (Ω × 1k) to the
ignition coil.
Check that the secondary coil has the
specified resistance.
Secondary coil resistance:
6.3 ~ 9.5 kΩ at 20 ˚C (68˚F)
5.Engine stop switch
Refer to "SWITCH INSPECTION".
8
6.Main switch
Refer to "SWITCH INSPECTION".
*
C0NTINUITY
BOTH MEET
SPECIFICATION
CORRECT
CORRECT
*
IGNITION SYSTEM
Tester (+) lead → Orange lead terminal
Tester (–) lead → Ignition coil base
Tester (+) lead → Ignition coil base
Tester (–) lead → Spark plug lead
OUT OF SPECIFICATION
Replace the ignition coil.
INCORRECT
Replace the handlebar switch (left).
INCORRECT
Replace the main switch.
8 - 10
– +
ELEC