47MS 460, MS 460 C
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,
b 3.5
VA
208RA053
321
: Remove spark plug boot and
connect it to the input
terminal (1). Push the tester’s
output terminal (3) onto the spark
plug.
– Crank the engine quickly with the
rewind starter (min. 1,000 rpm)
and check spark in the tester’s
window (2).
Warning!
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 7.6
Using the ZAT 3 ignition tester
5910 850 4520
It is necessary to use the ZAT 3
ignition tester 5910 850 4520 to test
the booster gap.
– Before starting the test, install a
VA
208RA054
ZAT 3
5910 850 4520
3
2
1
new spark plug in the cylinder
and tighten it down firmly, b 3.5
: Remove spark plug boot and
connect it to terminal (2).
: Attach ground terminal (1) to the
spark plug.
: Use adjusting knob (3) to set
spark gap to about 2 mm.
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).
Warning!
High voltage – risk of electrocution.
– Crank the engine quickly with the
rewind starter (min. 1,000 rpm)
and check sparkover in the
tester’s window (3).
Warning!
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 (3), check the ignition
system with the aid of the
troubleshooting chart, b 7.6
7.1.3 Testing the Ignition
Module
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