Engine Management; Adjusting The Carburetor - Stihl MS 461 R Manual De Instrucciones

English

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.
44

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 adjusting screws on this carburetor
can only be set within narrow limits.
The ignition module limits the maximum
speed. It is therefore not possible to
increase the maximum speed by further
turning the high speed screw (H) in the
clockwise direction (making the mix
leaner).
Standard setting
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
Turn the high speed adjusting
N
screw (H) counterclockwise as far
as possible – max. 3/4 turn
Turn the low speed adjusting
N
screw (L) clockwise – as far as
possible – then back off 1/4 turn
Setting the idle speed
Make standard setting
N
Start engine and let it warm up
N
Engine stops when idling or saw chain
rotates at idle speed
Turn the idle speed adjusting
N
screw (LA) clockwise until the saw
chain begins to run – then turn it
back 1 1/2 turns.
MS 461 R