Stihl MS 171 Technical Information

Technical Information 27.2013 Page 7
TI_27_2013_30_01_01.fm
5.2 Contact spring
The previous contact spring (1) 1139 442 1600 is
replaced by the new contact spring (2)
1139 442 1601.
The new contact spring 1139 442 1601 has
changed geometrically and unlike the previous
contact spring 1139 442 1601, it is not heat treated.
The previous contact spring 1139 442 1600 is
brown-yellow, the new contact spring
1139 442 1601 is silver colored and is marked
"01A".
Spare parts/service notes
The new contact spring 1139 442 1601 can be used
for versions with a previous ignition module
1139 400 1307 and new ignition module
1139 400 1311.
The previous contact spring 1139 442 1600 must
not be used for versions with a new ignition module
1139 400 1311.
The previous contact spring 1139 442 1600 is no
longer available as a spare part.
5.3 Summary – ignition module, wiring harness, contact spring
Left: previous contact spring 1139 442 1600
Right: new contact spring 1139 442 1601
2
1
533TI035 KN
01A
Item Part Name Previous New Rem.
1 Ignition module 1139 400 1307 1139 400 1311 2)
2 Wiring harness 1139 440 3000 1139 440 3001 2)
3 Engine housing (Standard);
including Item 5
1139 020 3006 1139 020 3006
4 Engine housing (Easy2Start™);
including Item 5
1139 020 3007 1139 020 3007
5 Contact spring 1139 442 1600 1139 442 1601 1) 3)
Modification to be introduced : continuously
Remarks
1) Previous version of part no longer available from factory
2) Previous version of part remains available for older models
3) New version of part can also be used for older machines

Stihl MS 171 Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	350 mm
Product color	Black, Grey, Orange
Chain tensioner	Yes
Motor speed (max)	10000 RPM
Fuel tank capacity	0.266 L
Engine displacement	31.8 cm³
Power source	Gasoline
Sound power level	112 dB
Vibration emission	4.5 m/s²
Sound pressure level	99 dB