Checking The Ignition Coil; Checking The Cdi Unit; Checking The Charge Coil - Yamaha FT50C Service Manual

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Checking the ignition coil

1. Remove the spark plug caps from the
high-tension cords by turning the caps
counterclockwise.
2. Measure the ignition coil resistance.
Replace if out of specification.
Ignition coil resistance:
Primary coil:
Orange (O) – Black (B)
0.08–0.11 Ω at 20 °C (68 °F)
Secondary coil:
High-tension cord – High-tension
cord
3.5–4.7 kΩ at 20 °C (68 °F)

Checking the CDI unit

1. Measure the CDI unit output peak volt-
age. If below specification, measure the
charge coil output peak voltage and the
pulser coil output peak voltage. Replace
the CDI unit if the output peak voltage of
both coils is above specification.
8-11
Electrical systems
WARNING
When checking the peak voltage do not
touch any of the connections of the digital
tester leads.
NOTE:
• Use the peak voltage adaptor with the digi-
tal circuit tester.
• When measuring the peak voltage, set the
selector on the digital circuit tester to the
DC voltage mode.
Digital circuit tester: 90890-03174
Peak voltage adaptor: 90890-03172
CDI unit output peak voltage:
Black/orange (B/O) – Black (B)
Black/white (B/W) – Black (B)
Unloaded
r/min
Cranking
DC V 126 150

Checking the charge coil

1. Measure the charge coil output peak volt-
age. Replace the stator coil if below
specification.
Loaded
1,500 3,500
151 116
62Y5A11