MS 171, MS 181, MS 181 C, MS 211, MS 211 C
English
45
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.
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
N Shut off the engine.
N Check the air filter and clean or
replace if necessary.
N Check the spark arresting screen
(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) = 1/4
N Determine the required standard
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?
N Continue with "Standard setting A"
Is range of adjustment less than 1 turn?
N Continue with "Standard setting B"
Standard setting A
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise until it is against
its seat, then turn it back 1 full turn
Engine Management Adjusting the Carburetor
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