Technical Information · issue 30 of 1999
ZAT 4 Ignition System Tester
IssueTI 30/1999
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Technical Information
30.1999
ZAT 4 Ignition System Tester
901TI000 KN
The ZAT 4 is a new, inexpensive ignition system
tester for spark ignition engines.
It is installed between the spark plug and spark plug
boot.
A lamp comes on to indicate the presence of ignition
voltage.
Part No.: 5910 850 4503.
TI_30_1999_30_01.fm english / USA Page 2 of 2
Page 2 Technical Information 30.1999
Checking ignition system
. Install the ZAT 4 between the spark plug and the
spark plug boot
. Move Master Control or slide control to the run
position
. Pull the starter rope and observe the indicator
lamp at the same time:
If the lamp comes on during cranking it indicates
that the system is delivering sufficient voltage.
Warning! Engine may start and accelerate.
If the lamp does not come on during cranking,
either the ignition system or the wiring is faulty.
© 1999 Andreas STIHL AG & Co. Technical Documentation
Waiblingen D1/MTK-st 6707
TI_30_1999_30_01.fm Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.