Operating Instructions; Cleaning The Air Filter - Stihl HL 91 K Instruction Manual

English
Running engine stalls in cold start
position g or under acceleration.
Continue cranking in position F until
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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, depress 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 according to
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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 protects engine-
mounted components (ignition,
carburetor) from thermal overload.
After Finishing Work
Storing for a short period: Wait for the
engine to cool down. Empty 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".

Cleaning the Air Filter

If there is a noticeable loss of engine
power
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Set knob for warm start (1) to g
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Turn screw (2) in filter cover (3)
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counterclockwise until the cover is
loose
Remove filter cover (3)
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Clean away loose dirt from around
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the filter
5
Grip into the recess (4) in the filter
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housing and remove the felt filter (5)
Replace felt filter (5) – as a
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temporary measure you can knock it
out on the palm of you hand or blow
it out with compressed air – do not
wash
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HL 91 K