Testing The Ignition Module - Stihl MS 290 Manual

2
: Tighten down the screw (1) firmly,
b 3.5
: Make sure the crimp connections
of the ground wires (3) are next to
one another.
: Tighten down the screw (2) firmly,
b 3.5
– Remove setting gauge and use a
feeler gauge to check the air gap.
It should be 0.15 - 0.3 mm.
MS 290, MS 310, MS 390
3
1
: Fit short circuit wire (1) on tag (2)
so that crimping faces the engine
housing.
: Clip the short circuit wire (1) to
the retainer (arrow).
Install all other parts in the reverse
sequence.
7.1.3
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.
1
The ignition test refers only to a
spark test, not to ignition timing.
2
1
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
: 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.
Testing the Ignition
Module
3
2
39