Ignition Lead - Stihl MS 231 Manual

Using the ZAT 3 ignition tester
5910 850 4520
1
2 3
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly.
: Connect spark plug boot to the
terminal (2).
: Attach the ground terminal (1) to
the spark plug.
: Use adjusting knob (4) to set the
spark gap to about 2 mm,
see window (3).
1
3 4
2
While using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers or other
parts of your body at least 1 cm
away from the spark window (3),
high voltage connection (2), ground
connection (5) and the ground
terminal (1).
High voltage – risk of electric shock.
48
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– Crank the engine quickly with the
rewind starter and check spark in
the tester's window (3).
The engine may start and
accelerate during the test.
If a spark is visible in the
window (3), the ignition system is in
order.
– If no spark is visible in the
window (3), check the ignition
4
system with the aid of the
troubleshooting chart, b 7.8
7.5 Spark Plug Boot / Ignition
Lead
The ignition module (1) and ignition
lead (2) form a unit. A new ignition
module must be installed if the
ignition lead is damaged.
– Remove the shroud, b 6.4
– Remove the spark plug boot and
pull the ignition lead out of the
guides, b 7.3
5
: Use suitable pliers to pull the leg
spring out of the spark plug boot.
– Unhook the leg spring from the

ignition lead.

– Pull the boot off the ignition lead.
Installing
– If the ignition module is new, use
a pointed tool to pierce the center
of the ignition lead's insulation,
about 15 mm from the end of the
lead.
: Pinch the hook of the leg spring
into the pierced hole in the center
of the lead (arrow).
– Coat the inside of the spark plug
boot with STIHL press fluid,
b 14
: Hold the ignition lead and leg
spring together and push them
into the spark plug boot.
MS 231, MS 231 C, MS 251, MS 251 C