Replacing The Air Filter; Engine Management; Adjusting The Carburetor - Stihl FS 111 Instruction Manual

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Replacing the Air Filter

Filters have an average life of more than
a year. Do not remove the filter cover or
replace the air filter as long as there is no
noticeable loss of power.
If there is a noticeable loss of engine
power
3
4
Turn the choke knob to g.
N
Loosen the screws (1).
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Remove the filter cover (2).
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Clean away loose dirt from around
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the filter.
Remove the filter element (3).
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Replace dirty or damaged filter
N
element (3).
Replace any damaged parts.
N
Installing the Filter Element
Install the filter element (3) in the
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filter housing and fit the cover.
Insert the screws (1) and tighten
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them down firmly.
38

Engine Management

Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
2
1
1

Adjusting the Carburetor

The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.
Adjusting Idle Speed
Engine stops while idling
Warm up the engine for about
N
3 minutes.
Turn the idle speed screw (LA)
N
slowly clockwise until the engine
runs smoothly – the cutting
attachment must not run.
Cutting attachment runs when engine is
idling
Turn the idle speed screw (LA)
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slowly counterclockwise until the
cutting attachment stops running
and then turn the screw about
another 1/2 to 3/4 turn in the same
direction.
WARNING
If the cutting attachment continues to run
when the engine is idling, have your
machine checked and repaired by your
servicing dealer.
FS 111, FS 111 R