Cleaning The Air Filter; Engine Management; M-Tronic - Stihl MS 261 C-M Instruction Manual

English
► Synthetic fabric filter: For use in severe condi‐
tions, e.g. extreme wintry operating conditions
- such as powdery or drifting snow. Less suita‐
ble for very dusty conditions.
STIHL filters have a long service life in dry oper‐
ating conditions.
► Always use STIHL filters in dry state.
Dirty air filters reduce engine power, increase
fuel consumption and make starting more diffi‐
cult.

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 to
remove or install 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 damaged filters.
23.1.2 Cleaning the Air Filter
► Knock out the filter.
► Spray outside of filter with STIHL special
cleaner or soapy water.
28
► 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.
23.1.3 Installing the Air Filter
1.
2.
► Place the air filter in position.
► Push the air filter towards the filter housing
and turn it clockwise at the same time until it
engages – the "STIHL" name must be horizon‐
tal.
► Install the shroud – see "Shroud".

24 Engine Management

Exhaust emissions are controlled by the design
of the engine and components (e.g. carburation,
ignition, timing and valve or port timing).

25 M-Tronic

During operation the chain saw automatically
adjusts to the optimum power.
Depending on the STIHL M‑Tronic version the
chain saw can be adjusted more quickly to the
optimum power in two different ways:
– "Speeding up automatic adaptation of the
chain saw"
– "Calibrating the chain saw"
23 Cleaning the Air Filter
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