Adjusting; (One Screw) - Stihl FS 120 Manual

5/20/2018
Turn the idle speed screw (LD)
counterclockwise until cutting tool
stops rotating –and then turn it
about another one full turn in the
same direction.
Note:
If the engine does not reach
6,000 rpm in starting throttle
position, readjust the throttle
cable, see 7.5.
FS 120, 200, 300, 350, 400, 450, FR 350, 450
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8.2.5

Adjusting

(one screw)

The carburetor has no adjusting
screws for maximum engine
speed (H screw) or idle mixture
(L screw).
The carburetor is tuned so that the
engine receives an optimum fuel-
air mixture in all operation condi-
tions.
A slight correction of the idle
speed may be necessary. Use the
following procedure:
- Mount approved cutting tool.
- Check the air filter, replace if
necessary.
- Check spark arresting screen,
clean or replace as necessary.
- Start the engine and allow it to
warm up.
LD
Adjust idle speed correctly with the
idle speed screw (LD): the cutting
tool must not rotate.
Adjusting idle speed
Engine stops while idling:
Turn the idle speed adjusting
screw (LD) clockwise until engine
runs smoothly –cutting tool must
not rotate.
Cutting tool rotates while
engine is idling:
Turn the idle speed screw (LD)
counterclockwise until cutting tool
stops rotating –and then turn
screw about another one full in the
same direction.
Note:
If the engine does not reach
6,000 rpm in starting throttle
position, readjust the throttle
cable, see 7.5.
1
+
-
A
V
2
2
2
A
R
0
5
2
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