English
N
N
Start and warm up the engine if
necessary.
Cutting attachment rotates when
engine is idling
Adjusting the Carburetor
Adjust idle speed with the idle speed
screw (LA) so that the cutting
attachments does not turn.
N
Turn the idle speed screw (LA)
The carburetor comes from the factory
with a standard setting.
counterclockwise until the tool stops
moving and then turn the screw
another full turn in the same
direction.
This settingprovidesan optimum fuel-air
mixture under most operating
conditions.
Fine Tuning for Operation in
Mountains or at Sea Level
If the cutting attachment continues
to rotate when the engine is idling,
have your machine checked and
repaired by your servicing dealer.
With this carburetor it is only possible to
make corrections with the adjusting
screws within fine limits.
A slight correction of the setting may be
necessary if engine power is not
satisfactory when operating at high
altitude or at sea level.
Erratic idling behavior, engine stops
even though setting of LA screw has
been corrected, poor acceleration
Standard Setting
N
Warm up the engine.
N
N
Shut off the engine.
At high altitude
Turn high speed screw (H)
clockwise (leaner) – no further than
stop.
Idle setting is too lean
Mount a cutting attachment – we
recommend you use a mowing
head.
N
N
Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
N
N
Check the air filter and replace the
element if necessary.
At sea level
N Turn high speed screw (H) slightly
counterclockwise (richer) – no
further than stop.
Erratic idling behavior, engine speed
drops when swinging the machine
Have the spark arresting screen
(not all markets) checked – see
“Inspection and Maintenance by
Dealer"
Idle setting is too rich
N
Turn the low speed screw (L)
clockwise (1/8 of a turn or 45° at a
time) until the engine runs smoothly
and accelerates well.
Adjusting Idle Speed
Warm up the engine.
Engine stops while idling
N
It is usually necessary to change the
setting of the idle speed screw (LA) after
corrections to the low speed screw (L).
N
Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the cutting
attachment must not turn.
N
N
Turn the high speed screw (H)
counterclockwise as far as stop
(max. 3/4 turn possible).
Turn the low speed screw (L)
counterclockwise as far as stop
(max. 3/4 turn possible).
FS 40, FS 40 C, FS 50, FS 50 C
25
| Categories | Blower Vacuum and Sweeper Manuals, STIHL Trimmer Manuals, Trimmer Manuals |
|---|---|
| Tags | STIHL FS 40, STIHL FS 50 |
| Download File |
|
| Language | English, Español |
| Product Brand | STIHL. Stihl Inc, USA - Corporate phone: (757) 486-9100. International Support Information: http://stihl.com Email: info@stihl.com, Trimmer |
| Document File Type | |
| Publisher | stihl.com |
| Wikipedia's Page | Stihl |
| Copyright | Attribution Non-commercial |
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