Motor Management; Adjusting The Carburetor - Stihl BG 55 Manual De Instrucciones

English / USA

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.
20

Adjusting the Carburetor

(With idle speed screw LD)
LD
+
-
The carburetor is set at the factory to
provide an optimum fuel-air mixture
under all operating conditions.
Standard setting
: Check the air filter and replace if
necessary.
: Start and warm up the engine.
: Carefully screw the idle speed
screw (LD) down onto its seat
counterclockwise (left-hand thread).
Then open it two full turns clockwise
(standard setting).
Engine stops when engine is idling:
Carry out standard setting
(open the LD screw two full turns)
: Rotate idle speed screw (LD) about
one half turn clockwise until the
engine runs smoothly.
Erratic idling behavior, poor
acceleration:
Carry out standard setting
(open the LD screw two full turns)
: Rotate idle speed screw (LD) about
one half turn counterclockwise.
BG 55, BG 65, BG 85, SH 55, SH 85