Operating Instructions - Stihl PC 70 Instruction Manual

Blip the throttle trigger to disengage
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the starting throttle position. The
slide control moves to the normal
run position F – and the engine
settles down to idle speed.
Open the throttle slightly and warm
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up the engine for a brief period.
If engine does not start
Choke lever
If you did not move the choke lever to e
quickly enough after the engine began to
fire, the combustion chamber is flooded.
Set the choke lever to e.
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Select the starting throttle position.
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Start the engine by pulling the
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starter rope briskly – 10 to 20 pulls
may be necessary.
If the engine still does not start
Push the slide control in the
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direction of the arrow on the stop
symbol (h) to STOP-0.
Remove the spark plug – see
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"Spark Plug".
Dry the spark plug.
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Open the throttle wide and pull the
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starter rope several times to clear
the combustion chamber.
Refit the spark plug – see "Spark
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Plug".
Move the slide control to START.
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Set the choke lever to e – even if
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the engine is cold.
Now start the engine.
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PC 70, PC 75
Throttle cable adjustment
Check adjustment of throttle cable –
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see chapter on "Adjusting the
Throttle Cable".
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 filled with fuel.
Set the choke lever 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 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".
English
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