Adjusting The Carburetor - Stihl MM 55 Instruction Manual

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
Mount the MultiTool.
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.
MM 55
Standard Setting
L
Turn high speed screw (H)
N
counterclockwise as far as stop (no
more than 3/4 turn).
Turn the low speed screw (L)
N
clockwise as far as stop, then turn it
back 3/4 turn.
Adjusting Idle Speed
Carry out the standard setting.
N
Start and warm up the engine for
N
3 minutes.
L
Engine stops while idling
Turn the idle speed screw (LA)
N
clockwise until the engine runs
smoothly – the cutting/working
attachment must not rotate.
Attachment runs when engine is idling
Turn the idle speed screw (LA)
N
counterclockwise until the
cutting/working attachment stops
moving and then turn the screw
another 1/2 to 1 full turn in the same
direction.
WARNING
If the cutting/working attachment
continues to run when the engine is
idling, have your machine checked and
repaired by your servicing dealer.
English
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