KTM 250 EXC RACING Owner's Manual page 164

Ignition Measure
Pulser coil
4K-3A Exciter
Charge coil
Pulser coil
4K-3B Exciter
Charge coil
3
cable colours
red – green 100 Ω ± 20 Ω
26 Ω ± 5.2 Ω
black/red– red/white
ground – yellow 0.74 Ω ± 0.15 Ω
red – green 100 Ω ± 20 Ω
15 Ω ± 3 Ω
black/red – red/white
0.65 Ω ± 0.15 Ω
ground – yellow
white – yellow 0.16 Ω ± 0.03 Ω
1
2
2
4
5
5
Resistance
Check stator and pulse generator
Use an ohmmeter to perform the following
measurements:
NOTE:
– The measuring must be performed at a temperature of 20° C.
Otherwise significant deviations must be expected. Replace the
stator and/or the pulse generator if the measured values deviate
significantly from the setpoint values.
– The 4K3A ignition system no longer has a charging coil from the
2004 model.
Replacing the stator 4K-3A
– Remove the bolt and dismount the retaining plate.
1
– Remove the 2 bolts
2
cover.
– Place a new stator in the ignition cover. Degrease the threads of all
3 bolts and apply Loctite 243.
– Mount the bolts and tighten them to 6 Nm.
– Place the wire harness in a non-energized condition and secure it
with the retaining plate. Do not forget the cable socket
Replacing the stator 4K-3B
– Remove the bolt and dismount the retaining plate.
4
– Remove the 2 bolts
5
cover.
– Place a new stator in the ignition cover. Degrease the threads of all
3 bolts and apply Loctite 243.
– Mount the bolts and tighten them to 10 Nm.
– Place the wire harness in a non-energized condition and secure it
with the retaining plate.
Ignition
General information
The measurements described below
will only reveal severe problems.
Coil short circuits leading to weak
ignition sparks or low generator
output, respectively, can only be
detected with the help of an ignition
test bench. In
malfunction always
cables and the plug and socket
connections of the ignition system
first.
Make sure to select the correct
measuring range when performing
measurements.
and take the stator out from the ignition
and take the stator out from the ignition
7-6E
the case of
check the
.
3