Standard Setting; Fine Tuning; Adjusting Idle Speed - Stihl MS 380 Manual

Standard Setting

(without tachometer)
H L
:
Shut off the engine.
: Check the air filter and clean or
replace it if necessary.
: Carefully screw both adjusting
screws down onto their seats
(clockwise).
:
Open high speed screw (H) one full
turn.
:
Open the low speed screw (L) one
full turn.
If you do not have a tachometer, do
not set the high speed screw any
leaner by turning it beyond the
standard setting.
MS 380

Fine Tuning

(with tachometer)
:
Check the air filter and clean or
replace it if necessary.
: Check chain tension.
: Start the engine and run until it is
warm.
:
Adjust idle speed correctly (chain
must not rotate).
:
Starting from the standard setting,
use the high speed screw (H) to
adjust the maximum engine speed
with a tachometer to 12,500 rpm
(with bar and properly tensioned
chain).
If the mixture is made too lean
there is a risk of engine damage
due to insufficient lubrication and
overheating.

Adjusting Idle Speed

L
Engine stops while idling
:
Open the low speed screw (L) one
full turn.
: Turn the idle speed screw (LA)
clockwise until chain begins to run –
then turn it back one quarter of a
turn.
Chain runs when engine is idling
:
Open the low speed screw (L) one
full turn.
:
Turn the idle speed screw (LA)
counterclockwise until chain stops
running – then turn screw another
quarter turn in the same direction.
English
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