Stihl FS 85 Service Manual

52 FC 75, FC 85, FH 75, FS 75, FS 80, FS 85, HL 75, KM 85, KW 85
Erratic idling behavior
– Idle setting is too rich. Turn the
low speed screw (L) clockwise
(about a quarter turn) until the
engine runs and accelerates
smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low
speed screw (L).
The limiter cap has to be removed
from the high speed screw (H) only
if it is necessary to replace the high
speed screw (H), clean the
carburetor or adjust it from scratch.
After removing the limiter cap it is
necessary to carry out the basic
setting.
Removing short limiter cap
: Push puller (2) 5910 890 4501,
open side facing you, between
the limiter cap (1) and carburetor
body and pry the cap off. If the
limiter cap is stuck on the screw,
turn the puller over so that its
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932RA316
12
open side faces the carburetor
body. Pry off the limiter cap.
Removing long limiter cap
: Use suitable pliers to pull off the
limiter cap.
– Screw down the high speed
screw (H) and low speed screw
(L) clockwise until they are
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932RA315
1
against their seats.
Carrying out basic setting
– Open the high speed screw (H)
1 1/2 turns counterclockwise.
– Open the low speed screw (L)
one full turn counterclockwise.
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932RA317
H
L
9.4.4 Service Adjustment, Carburetor with Limiter Cap

Stihl FS 85 Specifications

General

Engine Type	2-stroke
Displacement	25.4 cc
Weight	5.2 kg
Shaft Type	Straight
Starter	Recoil
Vibration Damping	Yes
Power Output	0.95 kW
Fuel Capacity	0.44 liters