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Stihl MS 171 Technical Information

Stihl MS 171
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Page 6 Technical Information 27.2013
TI_27_2013_30_01_01.fm
5. Ignition module, wiring harness,
contact spring
5.1 Ignition module, wiring harness
5.1.1 Ignition module
The previous ignition module 1139 400 1307 is
being replaced by the new ignition module
1139 400 1311.
The terminal on the previous ignition module
1139 400 1307 is bent (1), whereas on the new
ignition module 1139 400 1311 it is straight (2).
5.1.2 Wiring harness
The previous wiring harness 1139 440 3000 is being
replaced by the new wiring harness 1139 440 3001.
The new wiring harness 1139 440 3001 differs from
the previous wiring harness 1139 440 3000 as
follows:
The insulation is no longer needed on the
terminal connector of the short circuit wire (1)
The shrink tube is no longer needed on the
terminal connectorof the ground wire (2)
5.1.3 Spare parts/service notes
The new ignition module 1139 400 1311 and new
wiring harness 1139 440 3001 must not be used for
machines with a previous ignition module
1139 400 1307 and previous wiring harness
1139 440 3000.
The previous ignition module 1139 400 1307 and
previous wiring harness 1139 440 3000 must not be
used for machines with a new ignition module
1139 400 1311 and new wiring harness
1139 440 3001.
The previous ignition module 1139 400 1307 and
previous wiring harness 1139 440 3000 remain
available as a spare part for older machines.
Left: previous ignition module 1139 400 1307
with bent terminal
Right: new ignition module 1139 400 1311 with
straight terminal
533TI027 KN
1 2
1139 400 1302 X 1139 400 1310 X
1139 400 1301 X
Top: previous wiring harness 1139 440 3000
Bottom: new wiring harness 1139 440 3001
12
533TI033 KN

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Stihl MS 171 Specifications

General IconGeneral
Idle speed- RPM
Motor type2-stroke motor
Chain pitch3/8 \
Blade length350 mm
Product colorBlack, Grey, Orange
Chain tensionerYes
Motor speed (max)10000 RPM
Fuel tank capacity0.266 L
Engine displacement31.8 cm³
Power sourceGasoline
Sound power level112 dB
Vibration emission4.5 m/s²
Sound pressure level99 dB

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