Engine Management; Adjusting The Carburetor - Stihl KM 90 R Manual De Instrucciones

Engine 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 90 R

Adjusting the Carburetor

The carburetor comes from the factory
with a standard setting.
The carburetor has been adjusted for
optimum performance and fuel
efficiency in all operating states.
The high speed adjusting screw and low
speed adjusting screw on this carburetor
can only be set within narrow limits.
Standard position
Switch off engine
N
Mount KombiTool with attached
N
working or cutting tool
Check air filter - clean or replace it if
N
necessary
Check throttle cable adjustment,
N
adjust if necessary – see "Adjusting
the throttle cable"
Check spark arresting screen -
N
clean or replace it if necessary
Carefully turn both adjusting screws
N
counterclockwise until they are
seated firmly:
– High speed screw (H) is 3/4 of a
turn open
– Low speed screw (L) is 3/4 of a turn
open.
Start the machine and let the engine
N
warm up
Using the idle speed screw (LA), set
N
the idle speed so that the working
tool does not move
Fine adjustment
A marginal adjustment of the setting of
the high speed screw (H) may be
necessary if the engine does not run
satisfactorily in mountain country, at sea
level or after changing working tools.
English
19