22
English / USA
BR 340, BR 340 L, BR 420, BR 420 C
Adjusting idle speed
Engine stops while idling
: Turn the low speed screw (L)
counterclockwise as far as stop.
: Turn idle speed screw (LA)
clockwise until the engine runs
smoothly.
Erratic idling behavior, poor
acceleration
: Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Units with a catalytic converter* may
only be operated with unleaded
gasoline and STIHL two cycle engine
oil or equivalent quality two cycle engine
oils in a mix ratio of 50:1 (see chapter
“Fuel”).
The catalylic converter in the muffler
reduces noxious emissions in the
exhaust gas.
Correct adjustment of the carburetor (if
adjustable) and observance of the
specified mix ratio of gasoline and two
cycle engine oil are essential to
minimize harmful exhaust emissions
and ensure a long catalyst service life.
* see “Guide to Using this Manual”
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
LA
L
373BA032 KN
Catalytic Converter* Checking the Spark Plug
000BA002 KN
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