Yamaha YP250R 2005 Service Manual page 304

EAS00746
6. Ignition coil resistance
• Disconnect the ignition coil connectors
from the ignition coil terminals.
• Connect the pocket tester (Ω × 1) to the
ignition coil as shown.
Positive tester probe → orange
Negative tester probe → black
• Measure the primary coil resistance.
Primary coil resistance
0.225 ~ 0.275 Ω at 25 °C (77 °F)
• Connect the pocket tester (Ω × 1k) to the
ignition coil as shown.
Positive tester probe → orange 1
Negative tester probe → spark plug lead 2
• Measure the secondary coil resistance.
1
1k
Secondary coil resistance
1.89 ~ 2.31 kΩ at 25 °C (77 °F)
• Is the ignition coil OK?
YES
2
NO
Replace the ignition
coil.
IGNITION SYSTEM
EAS00748
7. Pickup coil resistance
• Disconnect the pickup coil coupler from
the wire harness.
• Connect the pocket tester (Ω × 100) to the
pickup coil terminal as shown.
Positive tester probe → brown 1
Negative tester probe → red 2
• Measure the pickup coil resistance.
Pickup coil resistance
130 ~ 150 Ω at 20 °C (68 °F)
• Is the pickup coil OK?
EAS00749
8. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
8 - 10
ELEC
YES
Replace pickup coil/
stator assembly.
YES
Replace the
switch/immobilizer
antenna.
– +
NO
NO
main