Cleaning The Air Filter; Adjusting The Carburetor - Stihl MS 231 Instruction Manual

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22.2 HD2 filter
► HD2 filter (black filter frame, pleated filter
material) for extreme wintry conditions (e.g.
powder or drifting snow) or very dusty work
areas.

23 Cleaning the Air Filter

23.1 If there is a noticeable loss of
engine power.
► Remove the shroud – see "Shroud".
23.1.1 Removing the air filter
► Clean away loose dirt from around the filter.
NOTICE
To avoid damaging the filter, do not use tools for
removing and installing the air filter.
1.
2.
► Rotate the air filter a 1/4 turn counterclockwise
and lift it away in the direction of the rear han‐
dle.
► Always replace a damaged filter.
23.1.2 Cleaning the air filter (fleece filter)
► Knock out the filter or blow it clear with com‐
pressed air from the inside outwards.
If knocking it out or blowing it clear is not suffi‐
cient to remove stubborn dirt, or if the filter fabric
is sticky, perform the following steps:
► Wash the filter in STIHL special cleaner (spe‐
cial accessory) or a clean, non-flammable sol‐
ution (e.g. warm soapy water). Rinse the filter
30
from the inside outwards under a jet of water –
do not use a pressure washer.
► Dry the filter components – do not expose to
high temperatures.
NOTICE
– Allow air filter to dry without using any external
source of heat.
– Do not impregnate the filter with oil.
► Install the air filter.
23.1.3 Cleaning the air filter (HD2 filter)
► Knock out the filter.
► Spray outside of filter with STIHL special
cleaner or soapy water.
► Rinse outside of filter under warm running
water.
NOTICE
– Allow air filter to dry without using any external
source of heat.
– Do not impregnate the filter with oil.
► Allow air filter to dry.
► Install the air filter.
23.1.4 Installing the air filter
1.
2.
► Place the air filter in position.
► Push the air filter in the direction of the filter
housing and turn it clockwise at the same time
until it engages – the "STIHL" name must be
horizontal.
► Install the shroud – see "Shroud".

24 Adjusting the Carburetor

24.1 Basic information
The carburetor comes from the factory with a
standard setting.
The carburetor has been adjusted for optimum
performance and fuel efficiency in all operating
states.
23 Cleaning the Air Filter
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