Checking The Ignition Coil; Checking The Cdi Unit - Yamaha 250GETO Service Manual

ELEC

Checking the ignition coil

1. Remove the CDI unit cover, and then
remove the ignition coils.
2. Disconnect the ignition coil connectors.
3. Measure the ignition coil resistance.
Replace the ignition coil if out of specifi-
cation.
Ignition coil resistance:
å Primary coil:
Black/white (B/W) – Black (B)
0.18 – 0.24 Ω at 20°C (68°F)
∫ Secondary coil:
Black/white (B/W) – Spark plug wire
2.72 – 3.68 kΩ at 20°C (68°F)
8-9
Electrical system
6G480105

Checking the CDI unit

1. Remove the CDI unit cover.
2. Connect the digital circuit tester with
peak voltage adaptor B to the ignition coil
lead and the ground.
3. Measure the CDI unit output peak volt-
age. If less than specification, measure
the charge coil output peak voltage.
Replace the CDI unit if the output peak
voltage of the charge coil is more than
specification.
DCV
CDI unit output peak voltage:
Black/white (B/W) – Ground (B)
r/min
Cranking
DC V 120
NOTE:
Remove the all spark plug caps to prevent
the engine ignite, when measure the CDI unit
peak voltage at engine cranking.
6S380090
Loaded
1,500 3,500
150 130
6S35H11