Stihl FS 91 Instruction Manual page 37

As soon as the engine runs
Press down the throttle trigger
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lockout and open the throttle – the
choke knob moves to the run
position F. After a cold start, warm
up the engine by opening the
throttle several times.
WARNING
There is a risk of injury if the cutting
attachment runs when the engine is
idling. Adjust the carburetor so that the
cutting attachment does not run when
the engine is idling – see "Adjusting the
Carburetor".
Your machine is now ready for
operation.
FS 91, FS 91 R
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.
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 lever to suit the
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engine temperature.
Now start the engine.
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English
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