Spark Plug Boot / Ignition Lead - Stihl MS 441 Manual

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 9.8.
1
2 3
Using the ZAT 3 ignition system
tester 5910 850 4520
– Before starting the test, install
a new spark plug and tighten it
down firmly.
– Tightening torques, b 3.5.
: Connect spark plug boot to
terminal (2).
: Attach ground terminal (1) to the
spark plug.
: Use adjusting knob (4) to set
the spark gap to approx. 2 mm,
see window (3).
MS 441, MS 441 C
1
While using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers and other
parts of the body at least 1 cm away
from the spark window (3), high
voltage connection (2), ground
connection (5) and ground
terminal (1).
Beware of electric shocks due to the
high voltage.
– Crank the engine quickly with the
rewind starter and check the
spark in the tester's window (3).
The engine may start and
accelerate during the test.
4
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 9.8.
9.4
5
2 3 4
– Remove ignition module,
: Pull grommet (1) off high-voltage
– Unscrew ignition lead (2) from
– Pull grommet (1) off ignition lead.
: Peel cover off spark plug boot.
Spark plug boot / ignition
lead
1
b 9.1.1.
connection (arrow).
contact pin and pull it out of the
high-voltage connection.
2
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