Testing The Ignition System - Stihl 4180 Series Manual

8.3 Testing the Ignition
System
1 2
Using 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, b 3.4
: Pull the boot off the spark plug
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).
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 ignition system with aid of
troubleshooting chart, b 8.4
54
1
3
Using ZAT 3 ignition system
tester 5910 850 4520
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly, b 3.4
: Pull the boot off the spark plug
and connect it to terminal (2).
: Attach the ground terminal (1) to
the spark plug.
: Use adjusting knob (3) to set the
spark gap to about 2 mm.
3
ZAT 3
5910 850 4520
2
: When using the ZAT 3, hold it
High voltage – risk of
electrocution.
– Crank the engine quickly with the
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 ignition system with aid of
Reassemble in the reverse
sequence.
only by the handle (4) or position
it in a safe place. Keep fingers or
other parts of body at least 1 cm
away from the spark window (3),
the high voltage connection (2),
ground connection (5) and the
ground terminal (1).
rewind starter (min. 1,000 rpm)
and check spark in the tester's
window (3).
troubleshooting chart,
b 8.4
Series 4180 Powerhead