Checking The Capacitor; Ignition Coil Sem/Kokusan; Cdi Unit - KTM 250 1998 Repair Manual

6.4 Checking the capacitor

– Discharge the capacitor by bridging the two terminals with a screwdriver and
remove.
– Connect the negative pole of a 12V battery with the negative terminal of the
capacitor. The connection between the positive pole of the battery and the posi-
tive terminal of the capacitor (marked +) is made with a test lamp
– When the power circuit is closed, the test lamp must begin to light up. As capa-
citor charging increases, the brightness of the test lamp must decrease.
– The test lamp must go out after 0,5-2 seconds (depending on the lamp capacity).
– If the test lamp does not go out or does not light up at all, the capacitor is faulty.
!
D
ISCHARGE THE CAPACITOR BEFORE AND AFTER EACH TEST
W
HEN INSTALLING THE CAPACITOR
ACCORDANCE WITH THEIR MARKINGS
3
6.5 Ignition coil (SEM)
As this ignition coil uses electronic components, you are advised not to use con-
ventional measuring instruments. An accurate function test can only be carried out
on an ignition test bench.
6.6 Ignition coil (Kokusan)
– Disconnect all cables and remove the spark plug connector.
– Use an ohmmeter to measure the following values.
M
EASUREMENT
primary coil
secondary coil
N : T
OTE HE INDICATED SETPOINT VALUES CORRESPOND TO A TEMPERATURE OF
R
EPLACE THE IGNITION COIL IF THE MEASURED VALUES DEVIATE SIGNIFICANTLY FROM THE SET
.
POINT VALUES

6.7 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
SURING DEVICES CAN DESTROY HIGHLY SENSITIVE ELECTRONIC COMPONENTS
CAUTION
.
,
MAKE SURE THAT THE TERMINALS ARE CONNECTED IN
(C /
ONNECT RED WHITE CABLE TO
C
ABLE COLOURS
blue/white – ground
blue/white – ignition wire
CAUTION
CDI
3
.
!
+ )
TERMINAL
6
3
R
ESISTANCE
0,425 – 0,575 Ω
10,8 – 16,2 kΩ
20° C.
-
!
. C -
UNIT OMMERCIAL MEA
.