Spark Test - Stihl MS 18 Servise Manual

12. Spark Test

Connect a spark
tester and pull the
rope through as if
trying to start the
engine
If no spark is present
try again with a new
plug
A fouled or
defective spark
plug may not show
spark on the tester
even if the ignition
system is OK
© STIHL Inc., Virginia Beach, VA 2013
12. Spark Test
If there is still a no
spark condition with a
new plug, carefully
disconnect the ground
wire from the terminal
on the ignition module
and now see if spark
is present
If there is no spark the
module is faulty
If there is spark the
stop circuit is faulty
© STIHL Inc., Virginia Beach, VA 2013
US/STR
US/STR
confidential
confidential
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