Yamaha 2002 CS50, Service Manual, Page: 170 / 204

ELEC
IGNITION SYSTEM
8-11
EAS00748
6. Pickup coil resistance
• Disconnect the pickup coil coupler from the
wire harness.
• Connect the pocket tester (
Ω
x 100) to the
pickup coil terminal as shown.
Positive tester probe white/blue
Negative tester probe ground
• Measure the pickup coil resistance.
Pickup coil resistance
460 ~ 600
Ω
at 20°C
(between white/red and
white/green)
• Is the pickup coil OK?
EAS00738
7. Main fuse
• Check the fuse for continuity.
Refer to “CHECKING THE FUSES” in
chapter 3.
• Is the fuse OK?
EAS00739
8. Battery
• Check the condition of the battery.
Refer to “CHECKING AND CHARGING THE
BATTERY” in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20°C
• Is the battery OK?
EAS00754
9. Wiring
• Check the entire ignition system’s wiring.
Refer to “CIRCUIT DIAGRAM”.
• Is the ignition system’s wiring properly con-
nected and without defects?
Replace the pickup
coil.
Replace the fuse.
• Recharge or
replace the
battery.
Properly connect or
repair the ignition
system’s wiring.
Replace the DC-
CDI unit.
YES
NO
YES
NO
YES
NO
YES
NO
B
W
W
L
/
Y
R
/
DC - CDI
MAGNETO
2
1