Stihl MS 171 Manual

76 MS 171, MS 181, MS 211
14.4.2 Inlet Needle
– Remove the metering
diaphragm, b 14.4.1
: Take out the screw (arrow).
: Pull the inlet control lever (1) with
spindle (2) out of the inlet
needle’s groove.
The small spring under the inlet
control lever may pop out during
disassembly.
: Remove the inlet needle (1).
533RA306 TG
1
533RA307 TG
2
533RA308 TG
1
2
– Remove the spring (2). Inspect
and replace if necessary.
: If there is an annular indentation
(arrow) on the sealing cone of the
inlet needle, fit a new inlet
needle.
: Fit the inlet needle (1).
: Fit the spring (2) in the bore.
: Position the inlet control lever (3)
with spindle (2) on the spring’s
seat (arrow) first, then slide the
inlet control lever’s clevis into the
groove in the inlet needle (1).
533RA309 TG533RA310 TG
1
2
3
533RA311 TG
21
Make sure the spring locates on the
control lever’s nipple.
– Press the inlet control lever down
and secure it with the screw.
– Check that inlet control lever
moves freely.
– Install the metering diaphragm,
b 14.4.1
– Reassemble all other parts in the
reverse sequence.
14.4.3 Fixed Jet
– Remove the metering
diaphragm, b 14.4.1
: Use a suitable screwdriver to
unscrew the fixed jet (1).
– Check the fixed jet and replace it
if necessary.
– Install in the reverse sequence.
533RA312 TG
1
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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