Motor Management; Adjusting The Carburetor - Stihl KM 85 Instruction Manual

Motor Management

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
KM 85, KM 85 R
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Adjusting the Carburetor

3 / 4
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed screw within fine
limits.
Standard Setting
:
:
H L
:
1
:
:
:
LA
:
:
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude, at sea level or
after changing the cutting tool.
Shut off the engine.
Mount the CombiTool.
Check the air filter and clean or
replace as necessary.
Check the spark arresting screen
and clean or replace as necessary.
Turn high speed screw (H)
3
counterclockwise (max. /
4
far as stop.
Carefully screw the low speed
screw (L) down onto its seat. Then
open it one full turn counter-
clockwise.
Start and warm up the engine.
Adjust idle speed with the idle speed
screw (LA) so that the tool does
move.
English
turn) as
21