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Stihl MS 171 Manual

Stihl MS 171
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85MS 171, MS 181, MS 211
: Check operation:
Lever (1) must engage the air
valve’s lever (2) when the throttle
shaft is turned.
The edge of the end cover must line
up with the edge of the carburetor
body.
The sides of the levers (1+2) must
not touch each other.
Clearance “a = about 0.3 mm,
b 14.4.1
Reassemble all other parts in the
reverse sequence.
14.4.9 Adjusting Screws
There are three adjusting screws on
the carburetor:
H = high speed screw (1)
L = low speed screw (2)
LA = idle speed screw (3)
If the carburetor cannot be adjusted
properly, the problem may be the
adjusting screws.
533RA364 TG
2
1
533RA365 TG
21
3
The high speed screw H has a
limiter cap, which has to be
removed before the screw is
removed.
Always install a new limiter cap.
Remove the carburetor, b 14.3
See also carburetor
troubleshooting,
Low speed screw
: Take out the low speed screw (1).
: Inspect the tip (arrow) for
damage or wear and replace the
screw if necessary.
Screw down the low speed screw
L as far as stop.
Continue with high speed screw
533RA366 TG
1
533RA367 TG
High speed screw
: Use tool 5910 890 4501 to pry the
limiter cap (1) off the high speed
screw.
Do not refit a limiter cap. Always
install a new one.
: Take out the high speed
screw (1).
1
533RA368 TG
1
533RA369 TG
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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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