Stihl BT 121 Instruction Manual page 14

English
N Stand the unit on the tip of the
auger.
N Disengage the auger brake by
moving the activating lever to
position B. Your earth auger is now
ready for operation.
Make sure the carburetor is correctly
adjusted. The auger must not rotate
when the engine is idling.
Shut off the engine
N Push the slide control in direction of
h – to STOP-0.
At very low outside temperatures:
N
As soon as the engine runs: Blip the
throttle trigger to disengage the
starting throttle position. The
12
slide control moves to the normal
run position (F) – and the engine
settles down to idle speed.
N Open the throttle slightly.
N Warm up the engine for a short
period.
If the engine does not start
If you did not turn the choke knob to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
N Turn the choke knob to e.
N Set the slide control, trigger
interlock and throttle trigger to the
starting throttle position.
N Start the engine by pulling the
starter rope briskly – 10 to 20 pulls
may be necessary.
If the engine still does not start
N Push the slide control in direction of
h – to STOP-0.
1
N Pull off the spark plug boot (1).
N Unscrew and dry off the spark plug.
N Open the throttle wide.
N
Crank the engine several times with
the starter to clear the combustion
chamber.
N
Refit the spark plug and connect the
spark plug boot – press it down
firmly.
N Move the slide control to START.
N Move the choke knob to e – even if
the engine is cold.
N Start the engine.
Throttle cable adjustment
N
Check adjustment of throttle cable –
see chapter on "Adjusting the
Throttle Cable".
If fuel tank has been run completely
dry and then refueled
N After refueling, press the fuel pump
bulb at least five times – even if the
bulb is filled with fuel.
N Set the choke knob according to
engine temperature.
N
Now start the engine.
BT 121