Ignition System, Troubleshooting; Removal Of Flywheel - Husqvarna 181 Workshop Manual

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Electric system
A. Ignition system,
trouble shooting
In all ignition testing the plug must be firmly earthed against the cylinder in
order to prevent damage to the system.
A
1.
A 2.
A 3.
A 4,
Remove the spark plug. Connect the ignition cable and "earth" the plug
against the cylinder. Check for a spark between the electrodes when you
rotate the engine by pulling smartly on the starting handle. The stop
switch should be in position 1.
If no spark occurs, try a new plug. If still no spark, check the connection
between ignition cable and spark plug protector.
if still no ignition spark between the electrodes, disconnect the short
circuiting cable from the switch. Check for a spark. In this case, the stop
switch is faulty and should be exchanged.
Should there still be no ignition, remove the starter and air conductor.
Check all cables and connections. Cables that are squeezed or otherwise
damaged should be exchanged.
Check simultaneously the gap between the magnet of the flywheel and
the core of the module, The gap should be 0.30 mm. Use air gap tool
5025134-02.
If no ignition after checks A 1 – A 4, the igntion coil should be
exchanged by means of a special tester, eg our electric system tester No.
5025124-01 (see chapter 3).
If no ignition after checks A 1–A 4, the ignition coil should be exchanged
and a new check made according to A 1.
The last step is to change the trigger module.
Check that the gap is exactly as stated above. Use air gap tool 5025134-02.
The ignition coil and trigger module may be checked by means of a special
tester, eg our electric system tester No. 5025124-01 (see
c 3
B .
Removalof flywheel
Remove the starter and disconnect carefully the cables from the air conductor.
Lift off the air conductor. Loosen the two screws A with Allen key No.
5025018-01 and remove the starter pawls B with the washers and springs.
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