Operating Instructions - Stihl BT 131 Instruction Manual

Stopping the Engine
Depress the momentary contact
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stop switch – the engine stops –
release the stop switch – it springs
back to the run position.
Other Hints on Starting
Engine stalls in cold start position g or
under acceleration.
Move the choke knob to < and
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continue cranking until the engine
runs.
Engine does not start in warm start
position <
Move the choke knob to g and
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continue cranking until the engine
runs.
If the engine does not start
Check that all settings are correct.
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Check that there is fuel in the tank
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and refuel if necessary.
Check that the spark plug boot is
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properly connected.
Repeat the starting procedure.
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Engine is flooded
Move the choke knob to F and
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continue cranking until the engine
runs.
BT 131
Fuel tank run until completely dry
After refueling, press the manual
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fuel pump bulb at least five times –
even if the bulb is already filled with
fuel.
Set the choke knob to suit the
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engine temperature.
Now start the engine.
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Operating Instructions

During Break-In Period
A factory-new machine should not be
run at high revs (full throttle off load) for
the first three tank fillings. This avoids
unnecessary high loads during the
break-in period. As all moving parts
have to bed in during the break-in
period, the frictional resistances in the
engine are greater during this period.
The engine develops its maximum
power after about 5 to 15 tank fillings.
During Operation
After a long period of full throttle
operation, allow the engine to run for a
short while at idle speed so that engine
heat can be dissipated by the flow of
cooling air. This helps protect engine-
mounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. To avoid
condensation, fill the fuel tank and keep
the machine in a dry place, well away
from sources of ignition, until you need it
again. For longer out-of-service periods
– see "Storing the Machine".
English
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