Yamaha YJ50RAP Service Manual page 188

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 1
Negative tester probe →
2
1
• Measure the primary coil resistance.
Primary coil resistance
0.18 ~ 0.28 Ω at 20 °C (68 °F)
• Connect the pocket tester (Ω × 1k) to the
ignition coil as shown.
Negative tester probe → orange 1
Positive tester probe → spark plug lead 2
1
2
• Measure the secondary coil resistance.
Secondary coil resistance
6.32 ~ 9.48 kΩ at 20 °C (68 °F)
• Is the ignition coil OK?
YES
ignition coil base 2
NO
Replace the ignition
coil.
IGNITION SYSTEM
EAS00748
7. Pickup coil resistance
• Disconnect the stator coil assembly cou-
pler from the wire harness.
• Connect the pocket tester (Ω × 100) to the
pickup coil terminal as shown.
Positive tester probe → white/red 1
Negative tester probe → white/blue 2
• Measure the pickup coil resistance.
Pickup coil resistance
248 ~ 372 Ω at 20 °C (68 °F)
(between white/red and white/
blue)
• 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?
7 - 11
ELEC
1
2
W/R W/L
W Y/R
YES
Replace the stator
coil assembly.
YES
Replace the main
switch.
– +
NO
NO