Engine Management; Adjusting The Carburetor; Spark Arresting Screen In Muffler - Stihl HT 105 Instruction Manual

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Engine Management

Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
28

Adjusting the Carburetor

The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.
Adjusting Idle Speed
Engine stops while idling
Warm up the engine for about
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3 minutes.
Turn the idle speed screw (LA)
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slowly clockwise until the engine
runs smoothly – the saw chain must
not rotate.
Chain rotates when engine is idling
Turn the idle speed screw (LA)
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counterclockwise until the chain
stops running and then turn the
screw another 1/2 to 3/4 turn in the
same direction.
WARNING
If the chain continues moving when the
engine is idling, have your power tool
checked and repaired by your servicing
dealer.
Spark Arresting Screen in
Muffler
WARNING
To reduce the risk of fire caused by hot
particles escaping from the machine,
never operate the machine without a
spark arresting screen, or with the spark
arresting screen damaged. Do not
modify the muffler or spark arresting
screen.
NOTICE
According to the law or regulations in
some countries or federal states, certain
operations may only be carried out if a
properly serviced spark arresting screen
is provided.
If the engine is down on power,
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check the spark arresting screen in
the muffler.
Wait for the muffler to cool down
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4
5
Undo screw (4)
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Lift the spark arresting screen (5)
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and pull it out.
Clean the spark arresting
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screen (5). If the screen is damaged
or heavily carbonized, install a new
one.
HT 105, HT 134, HT 135