Adjusting The Carburetor; General Information; Adjusting Idle Speed - Stihl MS 290 Manual De Instrucciones

English / USA

Adjusting the Carburetor

General information

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!
42
Standard setting
:
Shut off the engine.
:
Check the air filter and replace if
necessary.
:
Check the spark arresting screen
and clean or replace as necessary.
:
Turn the high speed adjusting screw
(H) counterclockwise up to the stop,
3
i.e. / turn from max. lean setting.
4
: Turn the low speed adjusting screw
(L) clockwise up to the stop – then
back off the screw one quarter of a
turn.

Adjusting idle speed

Engine stops while idling
:
Turn the idle speed adjusting screw
(LA) clockwise until chain begins to
run – then back off the screw one
quarter of a turn.
Chain runs when engine is idling
:
Turn the idle speed adjusting screw
(LA) counterclockwise until chain
stops running – then turn screw
another quarter turn in the same
direction.
MS 290, 310, 390