45
MS 271 C, MS 291 C
7.
Ignition System
Exercise extreme caution when
troubleshooting and carrying out
maintenance or repair work on the
ignition system. The high voltages
which occur can cause serious or
fatal accidents.
Troubleshooting on the ignition
system should always begin at the
– Remove the fan housing,
b
8.2
The electronic (breakerless) ignition
system basically consists of an
ignition module (1) and flywheel (2).
The ignition module accommodates
all the components required to
control ignition timing. There are
two electrical connections on the
coil body:
1. High voltage output with
fixed ignition lead.
2. Connector tag for the
short circuit wire.
Testing in the workshop is limited to
a spark test. A new ignition module
must be installed if no ignition spark
is obtained (after checking that
wiring and stop switch are in good
condition).
2710RA130 TG
2
1
7.1
Ignition Timing
Ignition timing is fixed and cannot
be adjusted during repair work.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment during
operation.
7.2
Preseparator
– Remove the fan housing,
b
8.2
:
Take out the screw (1).
:
Check the preseparator (2) and
replace if necessary
– Reassemble in the reverse
sequence.
7.3
Install new ignition
module
– Remove the fan housing,
b
8.2
– Pull the boot off the spark plug.
– Remove the preseparator,
b
7.2
2710RA131 TG
1
2
:
Lift the air guide shroud (1) a little
and pull the ignition lead (2) out
of the guides (arrows)
– take care not to distort the air
guide shroud.
:
Pull the short circuit wire (1) out
of the guide (arrow) and take it
away.
:
Take out the screws (2).
:
Remove the ground wire (3).
– Remove the ignition module.
– Check ignition lead, replace
ignition module if necessary
– Check the spark plug boot and
replace if necessary,
b
7.5
– Troubleshooting,
2710RA132 TG
1
2
2710RA135 TG
2
2
1
3
