Ignition System Troubleshooting - Stihl BR 500 Service Manual

8.7

Ignition System Troubleshooting

BR 500, BR 550, BR 600
Engine does not run
Check the spark plug:
– Smeared with oil, black?
– Sooted?
– Electrode gap correct?
– Contacts shorted?
Clean the plug, reset
or replace
Check 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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