► Loosen the screw (6) in the carburetor box
cover and remove the prefilter (7).
19.1.3 Cleaning the air filter
► Knock the filter out on the palm of your hand
or blow it clear with compressed air from the
inside outwards.
If filter is caked with dirt:
► Wash the filter in STIHL special cleaner (spe‐
cial accessory) or a clean, non-flammable sol‐
ution (e.g. warm soapy water) and then dry.
NOTICE
Do not use a brush to clean the fleece filter
► Always replace damaged filters.
19.1.4 Installing the air filter
► Reassemble the filter components and check
that the choke shutter (8) and torsion spring
are properly seated.
► The end of the spring (9) must engage the slot
(arrow).
► Secure the main filter and prefiler in position.
► Fit the carburetor box cover.
20 Adjusting the Carburetor
20.1 General Information
The carburetor comes from the factory with a
standard setting.
This setting provides an optimum fuel-air mixture
under most operating conditions.
20.2 Standard Setting
► Shut off the engine.
► Check the air filter and clean or replace if nec‐
essary.
► Turn high speed screw (H) counterclockwise
as far as stop (no more than 3/4 turn).
► Turn the low speed screw (L) clockwise as far
as stop, then turn it back 1/4 turn.
20.3 Adjusting Idle Speed
► Carry out standard setting.
► Start and warm up the engine.
20.3.1 Engine stops while idling
► Turn the idle speed screw (LA) clockwise until
the chain begins to run – then back it off
3/4 turn.
20.3.2 Saw chain runs while engine is idling
► Turn the idle speed screw (LA) counterclock‐
wise until the chain stops moving – then turn it
another 3/4 turn in the same direction.
WARNING
If the chain continues moving when the engine is
idling, have your saw checked and repaired by
your servicing dealer.
20.3.3 Erratic idling behavior, poor accelera‐
tion (even though standard setting of
low speed screw is correct)
Idle setting is too lean
English 20 Adjusting the Carburetor
28 0458-567-0121-B
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