Engine Management; Adjusting The Carburetor - Stihl Ms 201 Instruction Manual

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Engine 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.
28

Adjusting the Carburetor

Basic information
The carburetor comes from the factory
with a standard setting.
The carburetor has been adjusted for
optimum performance and fuel
efficiency in all operating states.
The high speed adjusting screw on this
carburetor can only be set within narrow
limits.
Standard position
Switch off the engine
N
Check the air filter – clean or replace
N
it if necessary
Check the spark arresting screen in
N
the muffler (present only in some
countries) – clean or replace it if
necessary
H
L
Turn the high speed screw (H)
N
counterclockwise as far as possible
(max. 3/4 turn)
Turn the low speed screw (L) gently
N
clockwise until it is firmly in its seat.
Open the low speed screw (L) 1 full
N
turn
Setting the idle speed
Engine stops when idling
Set low speed screw (L) to standard
N
setting
Turn the idle speed adjusting
N
screw (LA) clockwise until the saw
chain begins to rotate – then turn it
back 1 1/2 turns
MS 201, MS 201 C