Adjusting The Carburetor - Stihl ms 260 Instruction Manual

English / USA
Engine stops while idling
: Set low speed screw (L) one full turn
open.
: Turn the idle speed (LA) clockwise
until the chain begins to run. Then
back off the screw one quarter of a
turn.
Chain runs when engine is idling
: Set low speed screw (L) one full turn
open.
: Turn the idle speed (LA) counter-
clockwise until the chain stops
running. Then turn the screw
another quarter turn in the same
direction.
Erratic idling behavior, poor
acceleration even though setting of
LA screw is correct
Idle setting is too lean
: Turn low speed screw (L) counter-
clockwise until the engine runs and
accelerates smoothly.
48

Adjusting the Carburetor

Models with H-, L- and LA-screw
General Information
Your carburetor is preset at the factory
with the standard setting.
This setting is designed to provide an
optimum fuel-air mixture under most
operating conditions.
If the setting is too lean there is
a risk of engine damage due to
insufficient lubrication and
overheating.
Standard Setting
: Shut off the engine.
: Check the air filter and clean or
replace if necessary.
: Check the spark arresting screen* in
the muffler and clean or replace if
necessary.
* see "Guide to Using this Manual"
H L
3/4 1
: Turn high speed screw (H)
counterclockwise as far as stop (no
3
more than / turn)
4
: Carefully screw the low speed
screw (L) down onto its seat
(clockwise), then turn it back one full
turn counterclockwise.
Adjusting Idle Speed
Engine stops while idling
: Carry out standard setting on low
speed screw (L).
: Turn the idle speed screw (LA)
clockwise until chain begins to run –
1
then back it off / turn.
4
MS 260