Checking The Ignition Spark - Husqvarna 343R, 345RX, 343F, 345FX, 345FXT Workshop Manual

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The engine is equipped with an electronic ignition system completely without moving parts. Conse-
quently, a faulty component cannot be repaired, but must be replaced by a new component.
The spark in an electronic ignition system has a very short burn time and can therefore be interpreted as
weak and can be difficult to see while troubleshooting.
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Electrical system
Checking the ignition
spark
Clean the electrodes and check the
electrode gap.
502 51 91-01
If the electrodes are worn more than
50% the spark plug should be
changed.
Check if a spark occurs when attempt-
ing to start.
Test with test spark plug no. 502 71 13-
01 if no spark is seen.
502 71 13-01
Checking the ignition
spark
Remove the spark plug and clean it
from soot deposits with the help of a
steel brush.
Check the electrode gap. It should be
0.5 mm.
Adjust the gap as needed to the correct
value with the side electrode.
If the electrodes are worn more than
50% the spark plug should be changed.
Too large a spark gap entails a great
deal of stress on the ignition module
and risk for short-circuiting.
Also check that the stop switch is in the
start position.
Earth the spark plug on the cylinder
and pull sharply on the start handle.
A spark should be seen between the
electrodes.
If no spark is seen test with test spark
plug no. 502 71 13-01.
If a spark then occurs, the spark plug is
faulty.
Try a new spark plug.