Stihl BT 120 C Manual

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•
Check air filter and fit a new one if
necessary.
•
Check spark arresting screen and
clean or replace as necessary.
•
Carefully screw the idle speed
screw /'down onto its seat coun-
terclockwise (left-hand thread).
Then open it two turns clockwise.
This is the standard setting.
•
Start and warm up the engine
•
Now adjust idle speed correctly with
the idle speed screw /': the dril-
ling spindle must not rotate.
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•
Turn the idle speed screw /'
clockwise until the engine runs
smoothly - drilling spindle must not
rotate.
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•
Turn the idle speed screw /'
counterclockwise until drilling
spindle stops rotating - then turn the
screw about another one full turn
in the same direction from that
position.
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•
Move choke knob to J
Press in the tab .
Remove the filter cover .
•
Clean away loose dirt from inside
filter cover and around the filter.
•
Remove filter  and inspect -
replace if dirty or damaged.
•
Install filter in the filter cover.
•
Refit the filter cover.
250BA021 KN
+
LD
-
1
2
3
250BA022 KN
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Dirty air filters reduce engine power,
increase fuel consumption and make
starting more difficult.
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Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components
(e.g. carburetion, ignition, timing and
valve or port timing) without the addition
of any major hardware.
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This carburetor does not have a high
speed adjusting screw (H screw) or a
low speed adjusting screw (L screw).
The carburetor is set at the factory to
guarantee an optimum fuel-air mixture
under all operating conditions.
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Stihl BT 120 C Specifications

General

Brand	Stihl
Model	BT 120 C
Category	Lawn and Garden Equipment
Language	English