Checking The Ignition Spark - Husqvarna 545RX Workshop Manual

2
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 inter-
preted as weak and can be diffi cult to see while troubleshooting.
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Electrical system
Checking the ignition
spark
Clean the electrodes and check the elec-
trode gap.
502 51 91-01
If the electrodes are worn more than 50%
the spark plug should be changed.
If the engine does not start or misfi res
despite the spark plug showing no signs of
wear, try with a new spark plug.
Earth the spark plug and check whether
there is a spark when attempting 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.
If the engine does not start or misfi res
despite the spark plug showing no signs of
wear, try with a new spark plug.
Earth the spark plug by connecting it
with a starter screw using a steel wire as
illustrated.
Pull the starter handle sharply.
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.