Stihl HT 131 User Manual

55Series 4180 Powerhead
8.4 Ignition System Troubleshooting
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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Stihl HT 131 Specifications

General

Engine Power	1.4 kW (1.9 bhp)
Displacement	36.3 cc
Sound Power Level	106 dB(A)
Overall Length	270 - 390 cm
Guide Bar Length	30 cm
Power Source	Gas
Chain Pitch	3/8"
Chain Gauge	1.3 mm