Stihl MS 270 User Manual page 47

Warning!
The engine may start and
accelerate during the test.
If a spark is visible, the ignition
system is in order. In case of doubt
about the result, perform additional
test with ZAT 3.
If no spark is visible in the
window (2), check the following
points:
– Check the wiring harness for
damage – see 7.4.
– Check operation of start-stop
switch – see 7.5.
– Check leg spring – see
– If necessary, check ignition
system with aid of the
troubleshooting chart –
1
5910 850 4520
2
Using ZAT 3 ignition tester
5910 850 4520
It is necessary to use the ZAT 3
ignition system tester
5910 850 4520 to test the auxiliary
spark gap.
MS 270, MS 280
– 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 terminal (2).
Attach ground terminal (1) to the
spark plug.
Use adjusting knob (3) to set
spark gap to about 2 mm.
7.2.
see 7.6.
While using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers or other
parts of your body at least 1 cm
away from the spark window (3),
high voltage connection (2), ground
connection (5) and the ground
terminal (1).
3
Warning!
High voltage – risk of
electrocution.
ZAT 3
– Crank the engine quickly with the
rewind starter (min. 1,000 rpm)
and check sparkover in the
tester's window (3).
Warning!
The engine may start and
accelerate during the test.
If a spark is visible, the ignition
system is in order.
– If necessary, check ignition
system with aid of the
troubleshooting chart –
IIf no spark is visible in the
window (3), check the following
points:
– Check the wiring harness for
damage – see 7.4.
– Check operation of start-stop
switch – see 7.5.
– Check leg spring – see
see 7.6.
7.2.
47