Adjusting The Carburetor - Stihl SH 56 Instruction Manual

from the inside outwards under a jet
of water – do not use a pressure
washer.
Dry the filter – do not expose to high
N
temperatures.
Place the filter in position.
Install the filter element in the filter
N
housing.
Fit the filter cover and tighten the
N
filter cover lock clockwise.
BG 56, BG 56 C, BG 66, BG 66 C, BG 86, BG 86 C, SH 56, SH 56 C, SH 86, SH 86 C

Adjusting the Carburetor

General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
Shut off the engine.
N
Check the air filter and clean or
N
replace if necessary.
Check the spark arresting screen
N
(not in all models, country-specific)
in the muffler and clean or replace if
necessary.
Different Standard Settings
Different carburetors are installed at the
factory. A different standard setting is
necessary for each of these carburetors.
Standard setting A
High speed screw (H) = 3/4
–
Low speed screw (L) = 1
–
Standard setting B
High speed screw (H) = 3/4
–
Low speed screw (L) = 3/4
–
Determine the required standard
N
setting as follows: Turn the low
speed screw (L) carefully clockwise
as far as stop, then turn it
counterclockwise.
Is range of adjustment more than 1 turn?
Continue with "Standard setting A"
N
Is range of adjustment less than 1 turn?
Continue with "Standard setting B"
N
Standard setting A
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
carefully clockwise until it is against
its seat, then turn it back 1 full turn
English
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