Husqvarna 125C Workshop Manual page 11

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The engine is equipped with an electronic ignition system completely without moving parts. Consequently,
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.
10
Electrical system
Checking the ignition
spark
Clean the electrodes and check the
electrode gap.
If the electrodes are worn more than
50% the spark plug should be changed.
If the engine does not start or misfires
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
0.6 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 misfires
despite the spark plug showing no
signs of wear, try with a new spark
plug.
Earth the spark plug by connecting it
with the muffler 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.