Stihl BT 120 C User Manual

20
English / USA
BT 120 C
Engine stops while idling
: Turn the idle speed screw (LD)
slowly clockwise until the engine
runs smoothly – the drilling spindle
must not rotate.
Drilling spindle rotates when engine
is idling
: Turn the idle speed screw (LD)
counterclockwise until the drilling
spindle stops rotating – then turn the
screw about another one full turn in
the same direction from that
position.
Erratic idling behavior, poor
acceleration
: Turn the idle speed screw (LD)
slowly counterclockwise no more
than one half turn.
General Information
Your carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed screw within fine
limits.
Standard Setting
: Shut down the engine.
: Remove the auger from the
machine.
: Check air filter and clean or replace
as necessary.
: Check that the throttle cable is
properly adjusted and readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
: Turn the high speed screw (H)
counterclockwise as far as stop
– max.
3
/
4
turn
: Carefully turn the low speed
screw (L) down onto its seat
clockwise. Then open it one turn
counterclockwise.
: Start and warm up the engine.
: Adjust idle speed with the idle speed
screw (LA) so that the drilling
spindle does not rotate.
Carburetor with H, L and LA
Screws
LA
H
L
1
250BA039 KN

Stihl BT 120 C Specifications

General

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