Stihl FS 85 Service Manual

50 FC 75, FC 85, FH 75, FS 75, FS 80, FS 85, HL 75, KM 85, KW 85
Adjusting idle speed
– Carry out the standard setting.
Engine stops while idling
: Turn the idle speed screw LA (1)
VA
936RA446
L A
L
1
clockwise until the cutting tool
begins to run, then turn the screw
back half a turn from that
position.
Cutting tool runs when engine is
idling
– Carry out the standard setting.
– Turn the idle speed screw LA (1)
counterclockwise until the cutting
tool stops running, then turn the
screw another half turn in the
same direction.
The carburetor is tuned at the
factory so that the engine receives
an optimum fuel-air mixture under
all operating conditions.
Standard setting
– Mount the cutting tool,
attachment or CombiTool (KM)
properly.
– Clean or replace the air filter if
necessary, b 9.1
– Clean or replace the spark
arresting screen if necessary,
b 5.3
: Carefully turn the idle speed
screw (LD) counterclockwise
down onto its seat. Then open it
two full turns.
Adjusting idle speed
– Carry out standard setting.
936RA440
VA
– Start the engine and allow it to
warm up.
Engine stops while idling
– Turn the idle speed screw (LD)
slowly clockwise until the engine
runs smoothly. The cutting tool
must not run.
Cutting tool runs when engine is
idling
– Turn the idle speed screw (LD)
counterclockwise until the cutting
tool stops running, then turn the
screw about another one turn in
the same direction.
Erratic idling behavior, poor
acceleration
– Turn the idle speed screw (LD)
slowly no more than half a turn
counterclockwise.
9.4.2 Carburetor with
LD Screw

Stihl FS 85 Specifications

General

Brand	Stihl
Model	FS 85
Category	Trimmer
Language	English