Stihl MS 170 User Manual

45MS 170, MS 180, MS 180 C
English / USA
Your carburetor is preset at the factory to
provide an optimum fuel-air mixture
under most operating conditions.
Adjusting idle speed
: Check the air filter and replace if
necessary.
: Check the spark arresting screen
and clean or replace as necessary.
: Carefully screw the idle speed
screw (LD) down onto its seat
counterclockwise (left-hand thread).
Then open it two full turns clockwise
(standard setting LD = 2).
: Start and warm up the engine.
: Use the idle speed screw (LD) to
adjust idle speed correctly:
The chain must not rotate.
Engine idle speed too low:
: Turn the idle speed screw (LD)
slowly clockwise until the chain
begins to run – then back off the
screw half a turn.
Chain runs when engine is idling:
: Turn the idle speed screw (LD)
slowly counterclockwise until the
chain stops running – then turn the
screw about another half turn in the
same direction.
:
If the chain continues moving when
the engine is idling, have your saw
checked and repaired by your
servicing dealer.
If the engine is low on power, check the
spark arresting screen* in the muffler.
: Take out the screws (1) and remove
the cover (2).
: Remove the spark arresting
screen (3) from the muffler (4).
: Clean the spark arresting screen
if necessary.
: If screen is damaged or coked up,
fit a new one.
: Refit the spark arresting screen,
place the cover in position and
secure with the screws.
* see "Guide to Using this Manual"
Adjusting the Carburetor
LD
143BA048 KN
Spark Arresting Screen*
in Muffler
3
2
1
1
4
143BA029 KN

Stihl MS 170 Specifications

General

Idle speed	- RPM
Chain pitch	3/8 \
Blade length	350 mm
Product color	Black, Orange, White
Automatic oiling	Yes
Oil tank capacity	0.145 L
Fuel tank capacity	0.25 L
Engine displacement	30.1 cm³
Engine power	1.7 hp
Power source	Gasoline

Weight and Dimensions

Weight	3900 g