Motor Management; Adjusting The Carburetor - Stihl MS 170 Manual De Instrucciones

Motor Management

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.
MS 170, MS 180, MS 180 C

Adjusting the Carburetor

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.
English / USA
: 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.
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