Adjusting The Carburetor - Stihl KM 90 Instruction Manual

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Adjusting the Carburetor

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 engine idle speed within fine
limits.
22
Standard Setting
: Shut off the engine.
: Assemble the KombiTool with the
attachment mounted.
: Check the air filter and replace if
necessary.
: Check adjustment of throttle cable
and readjust if necessary - see
"Adjusting the Throttle Cable"
: "Check the spark arresting screen
(not installed in all countries) and
clean or replace if necessary.
: Carefully turn both adjusting screws
counterclockwise as far as the stop:
The high speed screw (H) and low
speed screw (L) are now 3/4 turn
open.
: Start and warm up the engine.
: Adjust idle speed with the idle speed
screw (LA) so that the tool does not
move.
Fine Tuning
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 or at sea level.
Rule of thumb
Rotate the high speed screw (H) about
/ turn for every 3300 ft (1000 meter)
1 4
change in altitude
: Carry out the standard setting.
: Warm up engine for about
3 minutes.
KM 90, KM 90 R