Adjusting The Carburetor; Catalytic Converter; Spark Plug - Stihl SR 200 Instruction Manual

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4
► Remove the filter cover (2).
► Clean away loose dirt from around the filter.
► Pull off the adapter (3) and remove the fil‐
ter (4).
► Fit a new filter element. As a temporary meas‐
ure you can knock it out on the palm of your
hand or blow it out with compressed air. Do
not wash.
Replace any damaged parts.
17.2 Install the filter element.
► Fit the filter in the filter housing and push the
retainer into position.
► Refit the filter cover and turn the filter cover
lock to the horizontal position

18 Adjusting the Carburetor

The carburetor has been set at the factory to pro‐
vide an optimum fuel-air mixture under most
operating conditions.
18.1 Adjusting Idle Speed
18.1.1 Engine stops while idling
► Turn the idle speed screw (LA) clockwise until
the engine runs smoothly.

19 Catalytic Converter

Power tools with a catalytic converter (depending
on model) must be run on a 50 : 1 mixture of
unleaded gasoline and STIHL two-stroke engine
oil or equivalent two-stroke engine oil – see
chapter on "Fuel".
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3
2
The catayltic converter integrated in the muffler
reduces the harmful emissions in the exhaust
gas.
The correct carburetor setting (if adjustable) and
strict observance of the prescribed mix ratio of
gasoline and two-stroke engine oil are essential
to minimize harmful emissions and ensure a long
catalytic converter service life.

20 Spark Plug

► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► Fit a new spark plug after about 100 operating
hours – or sooner if the electrodes are badly
eroded. Install only suppressed spark plugs of
the type approved by STIHL – see "Specifica‐
tions".
20.1 Removing the Spark Plug
► Pull off the spark plug boot (1).
► Unscrew the spark plug.
20.2 Checking the Spark Plug
► Clean dirty spark plug.
► Check electrode gap (A) and readjust if neces‐
sary – see "Specifications".
► Rectify the problems which have caused foul‐
ing of the spark plug.
Possible causes are:
– Too much oil in fuel mix.
– Dirty air filter.
18 Adjusting the Carburetor
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