KTM 125 SX 2010, Owner'S Manual

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2004
1
2005
→
7-2
Art.- No. 3.206.088-E
Repair manual KTM 250 / 300
Measurement Cable colors Resistance
Primary coil white/blue - ground 0.425 - 0.575
Ω
Secondary coil white/blue - ignition wire 10.8 - 16.2 k
Ω
Ignition coil
– Disconnect all cables and remove the spark plug connector.
– Use an ohmmeter to measure the following values.
NOTE: The indicated setpoint values correspond to a temperature
of 20° C.
Replace the ignition coil if the measured values deviate significantly
from the setpoint values.
CDI unit
– Check the digital box for damage.
– Check the cables, plug and socket connections of the CDI unit
1
.
NOTE: The CDI unit function can only be checked on an ignition test
bench.
!
CAUTION
!
N
EVER USE A COMMERCIAL MEASURING DEVICE TO CHECK THE
CDI
UNIT
. C
OM
-
MERCIAL MEASURING DEVICES CAN DESTROY HIGHLY SENSITIVE ELECTRONIC COM
-
PONENTS
.
Checking the voltage regulator
– Start the engine and switch on the low beam.
– Connect a voltmeter to the two terminals of the capacitor.
– Accelerate the engine to a speed of 5000 r.p.m. and read off the
voltage.
Nominal value: 14.0 - 15.0 V
In the case of a significant deviation from the nominal value:
– Check the capacitor
– Check the connector between the stator and the voltage regulator-
rectifier and between the voltage regulator and the cable tree.
– Check the stator.
– Replace the voltage regulator-rectifier.
Checking the voltage regulator (250 EXC USA)
– Start the engine.
– Connect a voltmeter to the two terminals of the capacitor.
– Accelerate the engine to a speed of 5000 r.p.m. and read off the
voltage.
Nominal value: 14.0 - 15.0 V
In the case of a significant deviation from the nominal value:
– Check the capacitor
– Check the connector between the stator and the voltage regulator-
rectifier and between the voltage regulator and the cable tree.
– Check the stator.
– Replace the voltage regulator-rectifier.