Adjusting The Carburetor - Stihl MS 380 Manual

English
5
4
7
6
: Unscrew the slotted nuts (4).
: Remove the filter (5) and separate
the two halves of the filter.
:
Take out the screw (6) in the
carburtetor box cover and remove
the prefilter (7).
:
Knock the filter out on the palm of
your hand or blow it clear with
compressed air from the inside
outwards.
Do not use a brush to clean the
fleece filter.
30
In case of stubborn dirt:
: Wash the filter components in
STIHL universal cleaner or a clean,
non-flammable solution (e.g. warm
soapy water) and then dry.
:
Always replace a damaged filter.
:
Reassemble the filter components.
:
Make sure the choke shutter (8) and
torsion spring are properly seated:
The hook of the torsion spring (9)
must engage the slot (arrow).
: Secure the main filter and prefilter in
position.
:
Fit the carburetor box cover.

Adjusting the Carburetor

General Information
Your carburetor comes from the factory
with a standard setting.
This is the optimum setting under the
barometric pressure and climatic
conditions at the factory.
It ensures your machine will deliver
maximum power, be fuel efficient and
operate reliably.
Retuning may be necessary if there is a
change in barometric pressure (weather,
altitude), temperature or humidity.
Adjustment of the high speed screw
changes the power output and
maximum RPM of the engine when it is
running off load.
If the mixture is made too lean
there is a risk of engine damage
due to insufficient lubrication and
overheating.
MS 380