Cleaning The Air Filter; Adjusting The Carburetor - Stihl MS 180 Instruction Manual

English

Cleaning the Air Filter

If there is a noticeable loss of engine
power
N
Simultaneously press the throttle
trigger lockout and throttle trigger
and set the Master Control lever to
cold start l
N Remove the shroud – see "Shroud"
N Pull the filter upwards to remove
N Wash the filter in a clean, non-
flammable cleaning liquid (e. g.,
warm soapy water) and dry it
N Always replace a damaged filter
N Reinstall filter
28

Adjusting the Carburetor

Basic information
The carburetor has been factory-
adjusted to provide the engine with a
optimal fuel-air mixture in all operating
states.
Standard setting
N Check the air filter and replace if
necessary
N Check spark arresting screen –
clean or replace it if necessary
N Carefully screw the idle speed
screw (LD) down counterclockwise
(left-hand thread) until it is firmly
seated, then 2 turns clockwise
(standard setting LD = 2)
Setting the idle speed
N
Start and warm up the engine
N Using the idle speed screw (LD), set
the idle speed correctly: The saw
chain must not rotate
Engine speed too low when idling:
N Turn the idle speed adjusting
screw (LD) slowly clockwise until
the saw chain begins to rotate –
then back off 1/2 turn
Saw chain rotates at idle speed:
N Turn the idle speed adjusting
screw (LD) slowly counterclockwise
until the saw chain stops rotating –
then turn an additional 1/2 turn in
the same direction
If the saw chain continues to keep
rotating in idle even after
adjustment, have the chain saw
checked by a servicing dealer.
MS 170, MS 170 C, MS 180, MS 180 C