Stihl FS 120 R User Manual

FS 120, FS 120 R, FS 250
English
31
If there is a noticeable loss of engine
power
N Turn the choke knob to g.
N Press in the tab (1) and remove the
filter cover (2).
N Clean away loose dirt from around
the filter (3) and inside the filter
cover.
N Remove and check the filter
element – replace it if is dirty or
damaged.
N Install the filter element in the filter
cover.
N Refit the filter cover.
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
N Shut off the engine.
N Mount the cutting attachment.
N Check the air filter and clean or
replace if necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
Standard Setting
– High speed screw (H) = 1 1/2
– Low speed screw (L) = 1
N Turn the high speed screw (H)
carefully clockwise until it is against
its seat, then turn it back 2 full turns.
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 1 turn
Adjusting Idle Speed
N Carry out standard setting.
N Start and warm up the engine.
Engine stops while idling
N Turn the idle speed screw (LA)
clockwise until the engine runs
smoothly – the cutting attachment
must not rotate.
Air filter
250BA071 KN
Adjusting the Carburetor
255BA006 KN
H
L
255BA007 KN
LA

Stihl FS 120 R Specifications

General

Brand	Stihl
Model	FS 120 R
Category	Trimmer
Language	English