Stihl MS 171 Manual page 43

1
: Slide the setting gauge (1)
4118 890 6400 between the
arms of the ignition module and
the flywheel magnet.
– Press the ignition module against
the setting gauge.
– Hold the ground wire terminal
and tighten down the screws
firmly.
– Tightening torques, b 3.5
– Remove the setting gauge.
– Check operation
– rotate the flywheel and make
sure it does not touch the ignition
module.
: Fit the short circuit wire (1) in the
retainer (arrow) and reconnect it.
Short circuit and ground wires must
be next to one another in the
retainer – ground wire must face the
cylinder.
42
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1
: Push the ignition lead (1) into the
retainer (arrow) and pull it a little
in the direction of the air filter.
– Fit the boot on the spark plug.
– Reassemble all other parts in the
reverse sequence.
9.2 Ignition Timing
Ignition timing is fixed and cannot
be adjusted during repair work.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment..
9.3 Testing the Ignition
Module
To test the ignition module, use
either the ZAT 4 ignition system
tester 5910 850 4503 or the ZAT 3
1 ignition system tester
5910 850 4520.
The ignition test refers only to a
spark test, not to ignition timing.
1 2
Using the ZAT 4 ignition tester
5910 850 4503
– 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
input terminal (1). Push the
tester's output terminal (3) onto
the spark plug
High voltage – risk of electric shock.
: Crank the engine quickly with the
rewind starter and check spark in
the tester's window (2).
The engine may start and
accelerate during the test.
If a spark is visible, the ignition
system is in order.
If no spark is visible in the window
(2), check the ignition system with
the aid of the troubleshooting chart,
b 9.7
MS 171, MS 181, MS 211
3