Ignition Timing 9 7.2 Preseparator - Stihl MS 231 Manual

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
spark plug, b 3.5
– Remove the fan housing, b 8.2
1
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).
MS 231, MS 231 C, MS 251, MS 251 C
All manuals and user guides at all-guides.com
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.
1
: Pull the retainers (1) and (2)
carefully out of the slots (arrows)
and open them.
: Pull the ignition lead (3) out of the
guide.
2
1
2
1
3
4
3
: Disconnect terminal (1) of the
short circuit wire (2).
: Take out the screw (3) with
washers.
: Remove the ground wire (4).
– Remove the ignition module.
3
2
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