Testing The Ignition - Stihl MS 270 User Manual

If the ignition lead is damaged,
install a new ignition module.
If the spark plug boot is damaged,
install a new one – see 7.2.
Reassemble in the reverse
sequence.
1
Use the left-hand screw with
washer (arrow) to secure the the
ground wire (1).
46
1
– Rotate the flywheel until the pole
shoes are under the ignition
module.
Slide the setting gauge (1)
1111 890 6400 between the arms
of the ignition module and the
flywheel pole shoes.
– Press the ignition module against
the flywheel and tighten down the
mounting screws – see
– Remove the setting gauge and
use a feeler gauge to check the
air gap. It should be 0.2 to
0.3 mm.
– Connect the short circuit wire.
– Fit the fan cover and tighten
down the screws – see
– Fit the shroud – see 6.4.
7.1.3 Testing the Ignition Coil
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.
3.5.
1
Using the ZAT 4 ignition tester
3.5. 5910 850 4503
– Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly
– see 3.5.
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).
2 3
MS 270, MS 280