Adjusting The Carburetor - Stihl MS 201 Manual De Instrucciones

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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
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Check the air filter – clean or
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replace it if necessary
Check the spark arresting screen in
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the muffler (present only in some
countries) – clean or replace it if
necessary
38
H
L
Turn the high speed screw (H)
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counterclockwise as far as possible
(max. 3/4 turn)
Turn the low speed screw (L) gently
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clockwise until it is firmly in its seat.
Open the low speed screw (L) 1 full
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turn
Setting the idle speed
Engine stops when idling
Set low speed screw (L) to standard
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setting
Turn the idle speed adjusting
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screw (LA) clockwise until the saw
chain begins to rotate – then turn it
back 1 1/2 turns
Saw chain rotates at idle speed
Before adjustment, let the machine
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idle for 20 seconds
Set low speed screw (L) to standard
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setting
Turn the idle speed screw (LA)
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counterclockwise until the saw
chain stops turning – then turn
another 1 1/2 turns in the same
direction
If the saw chain continues to keep
rotating in idle even after
adjustment, have the chain saw
checked by a servicing dealer.
Speed erratic when idling; poor
acceleration
Before adjustment, let the machine
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idle for 20 seconds
Set low speed screw (L) to standard
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setting
Idle speed setting is too lean – turn
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the low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
adjusting screw (LA).
Adjustment for use in the mountains
or at sea level
A marginal adjustment may be
necessary if the engine does not run
satisfactorily in the mountains or at sea
level:
Check the standard setting
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Let the engine warm up
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MS 201, MS 201 C