KTM 250 SX 2003 Owner's Handbook Manual page 106

Measuring conditions:
– cold engine
– seat and tank removed
– all connectors and the ground connection in a non-corroding condition, connectors tightly connected
– spark plug screwed out and spark plug connector attached to ground
– light switch turned off
– the gap between the rotor and pulse generator must be set to 0.75 mm
– kick the kick starter forcefully at least 5 times for each measurement
3
R
5
1
1
S
4
2
Static ignition values 250 SX
Check the pulse generator for an output signal – two-pin connector
with green and red cable colors (also see circuit diagram):
– Apply the red measuring lead of the peak voltage adapter to the
green cable and the black measuring lead to the red cable, disconnect
1
both connectors to disconnect the CDI unit
Multimeter display: 5 volts +/- 1 volt
– Same measurement with CDI unit connected
Multimeter display: 3 volts +/- 0,5 volt
Check the generator charging coil for ignition capacitor charge for
output voltage – two-pin connector
cable colors (also see circuit diagram):
– Apply the red measuring lead of the peak voltage adapter to the
black/red cable and the black measuring lead to the red/white cable,
3
disconnect connector to disconnect the CDI unit
Multimeter display: 40 volts +/- 5 volts
– Same measurement with connectors CDI unit connected
Multimeter display: 220 volts +/- 10 volts
Check the primary voltage output
circuit diagram) for output voltage (blue/white cable color):
– Apply the red measuring lead
black/white cable (ground) and the black measuring lead
blue/white cable, CDI unit
Multimeter display: 210 volts +/- 10 volts
NOTE: the ignition coil does not need to be removed to measure.
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.
Measurement
Primary coil blue/white – ground
Secondary coil blue/white – ignition wire
CDI unit
Check the cables and plug and socket connections of the CDI unit
The CDI unit function can only be checked on an ignition test bench.
!
N
EVER USE A COMMERCIAL MEASURING DEVICE TO CHECK THE
C
OMMERCIAL MEASURING DEVICES CAN DESTROY HIGHLY SENSITIVE ELECTRONIC
.
COMPONENTS
2
3
with black/red and red/white
2
4
for ignition coil control (also see
R
of the peak voltage adapter to the
2 and ignition coil 5 connected
Cable colours
0,425 - 0,575 Ω
10,8 - 16,2 kΩ
CAUTION
6-2
1
S
to the
Resistance
2 .
!
CDI .
UNIT