Operation Manual

54 MS 241 C
: Press ignition lead (1) completely
into the guide (arrow)
– Note routing of the ignition lead,
see illustration
Ignition lead and spark plug boot
must not touch the air guide shroud.
: Press the holder (1) into the
slit (arrow) until it clicks into place
– Reassemble remaining parts in
reverse order
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7.4 Spark test check control
unit
The ignition test refers only to a
spark test, not the general functions
of the control unit; these are
described in the M-Tronic chapter,
b 8.2, b 8.5.
To spark test the control unit, use
either the ZAT 4 ignition system
tester 5910 850 4503 or the
ZAT 3 ignition system tester
5910 850 4520.
Using the ZAT 4 ignition system
tester 5910 850 4503
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly.
: Connect the spark plug boot to
the input terminal (1). Push the
tester's output terminal (3) onto
the spark plug
Danger! High voltage – risk of
electrocution.
– Crank the engine quickly with the
rewind starter and check
sparkover in the window (2) of
the ignition system tester
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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 7.8,
b 8.5
Using the ZAT 3 ignition system
tester 5910 850 4520
– Before starting the test, install a
new spark plug and tighten it
down firmly
: Connect the spark plug boot to
the terminal (2)
: Attach ground terminal (1) to the
spark plug
: Use adjusting knob (4) to set
spark gap to approx. 2 mm,
see window (3)
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