Stihl BG 55 Instruction Manual page 19

English
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.
18
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(With idle speed screw LA)
General information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the engine idle speed within fine
limits.
Standard setting
L
H
: Shut off the engine.
: Turn high speed screw (H)
counterclockwise as far as stop
3
(max. / turn).
4
: Set the low speed screw (L) to one
full turn open.
BG 55, BG 65, BG 85, SH 55, SH 85