7-5E
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.
!
CAUTION
!
N
EVER USE A COMMERCIAL MEASURING DEVICE TO CHECK THE CDI UNIT.
C
OMMERCIAL MEASURING DEVICES CAN DESTROY HIGHLY SENSITIVE ELECTRONIC
COMPONENTS
.
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.
Measure Cable colours Resistance
primary coil blue/white – ground 0.30 Ω ± 0.05 Ω
secondary coil blue/white – ignition wire
6.30 kΩ ± 1.25 kΩ
Troubleshooting in the ignition system
Before checking the ignition system check:
– if the emergency off switch is switched on
– if the battery is charged
– the main fuse
Check if an ignition spark is produced when the starter is operated. Proceed as follows:
– Pull off the spark plug connector.
– Disconnect the spark plug connector from the ignition cable.
– Hold the free end of the ignition cable approximately 5 mm (0.1968 in) from the ground.
– A strong spark should be visible when the electric starter is operated. If the battery level is low, turn off the light, and use the
kick starter.
– If a spark is visible, replace the spark plug connector.
– Twist out the spark plug and insert it into the spark plug connector.
– Connect the spark plug to the ground. A strong spark should be visible at the electrode when the electric starter is operated.
If this is not the case, the spark plug connector or the spark plug is defective.
– If no spark is produced during the first test, perform the following checks:
– emergency off switch and
– corresponding parts of the cable tree
– If the ignition is sufficiently supplied with power and no spark is produced, check:
– the ground connection of CDI unit and ignition coil
– the cable between the CDI unit and the ignition coil
– the pulse generator
– the stator
– the ignition coil
– the short circuit button
NOTE: The CDI unit cannot be tested with simple devices. It can only be replaced. It can only be tested on an ignition test bench.
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