Cleaning The Air Filter; Engine Management; Adjusting The Carburetor - Stihl MS 171 Instruction Manual

Cleaning the Air Filter

If there is a noticeable loss of engine
power
Remove the shroud – see "Shroud".
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Always replace damaged filters.
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Clean away loose dirt from around
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the filter.
Push the two locking tabs upwards,
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tilt the air filter towards the rear
handle and remove.
NOTICE
To avoid damaging the filter, do not use
tools for removing and installing the air
filter.
Blow out the filter with compressed
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air from the clean air side.
If the filter fabric is caked with dirt or no
compressed air is available:
Wash the filter in a clean, non-
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flammable solution (e.g. warm
soapy water) and then dry.
Reinstall the air filter.
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Install the shroud – see "Shroud".
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MS 171, MS 171 C, MS 181, MS 181 C, MS 211, MS 211 C

Engine Management

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.

Adjusting the Carburetor

General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
Shut off the engine.
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Check the air filter and clean or
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replace if necessary.
Check the spark arresting screen
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(not in all models, country-specific)
in the muffler and clean or replace if
necessary.
Standard Setting
H L
Turn high speed screw (H)
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counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
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clockwise as far as stop, then turn it
back 1/4 turn.
English
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