MS 170, MS 170 C, MS 180, MS 180 C
English
40
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
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 - 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
WARNING
If the saw chain continues to keep
rotating in idle even after adjustment,
have the chain saw checked by a
servicing dealer.
Engine Management Adjusting the Carburetor
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