Stihl MS 171 Manual page 44

1
2
Using ZAT 3 ignition tester
5910 850 4520
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly
– Tightening torques, b 3.5
– Connect spark plug boot to the
terminal (2).
: Attach ground terminal (1) to the
spark plug.
: Use adjusting knob (3) to set
spark gap to about 2 mm.
1
2 3 4
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).
MS 171, MS 181, MS 211
All manuals and user guides at all-guides.com
High voltage – risk of electric shock.
– 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, the ignition
3
system is in order.
If no spark is visible in the window
(3), check the ignition system with
the aid of the troubleshooting
chart, b 9.7
9.4 Spark Plug Boot
The ignition module and ignition
lead are an assembly. If the ignition
lead is damaged, install a new
ignition module.
– Remove the shroud, b 8.4
– Pull the boot off the spark plug.
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.
– Use a pointed tool to pierce the
center of the ignition lead's
insulation, 95.6 mm from the end
of the lead.
: Pinch the hook of the leg spring
into the center of the lead (arrow).
– Coat inside of spark plug boot
with Press Fluid, b 16
: Hold the ignition lead and leg
spring together and push them
into the spark plug boot.
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