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54 MS 240, MS 260, MS 260 C
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
ignition system tester
5910 850 4520.
The ignition test refers only to a
spark test, not to ignition timing.
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) on to
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).
165RA183 TG
1
2
3
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
Using the 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 the ground terminal (1) to
the spark plug.
: Use adjusting knob (4) to set the
spark gap to about 2 mm,
see spark window (3).
165RA184 TG
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).
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 in the window (3),
the ignition 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
165RA185 TG
1
2
3 4
5
55


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