Ignition System Troubleshooting - Stihl 4180 Series Manual

8.4

Ignition System Troubleshooting

Series 4180 Powerhead
Machine does not run
Slide control in position # or
stop switch
in position "I"?
Check the spark plug:
– Smeared with oil, black?
– Sooted?
– Electrode gap correct?
– Contacts shorted?
Clean, readjust or replace the spark plug
Check the spark plug boot:
– Firmly seated on plug
(leg spring)?
– Leg spring hook in center of ignition lead?
– Boot damaged?
If necessary, install new spark plug boot
and/or leg spring
Test ignition system with ZAT 3
or ZAT 4
(use ZAT 3 as main spark gap
see TI 32.94)
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