Operating Instructions - Stihl MS 171 Instruction Manual

At very low outside temperatures:
Warm up the engine.
As soon as the engine runs:
N Blip the throttle trigger to disengage
the starting throttle position. The
Master Control lever moves to the
normal run position – and the
engine settles down to idle speed.
N Disengage the chain brake by
pulling the hand guard back toward
the front handle as shown.
N Open throttle slightly – warm up
engine for short period.
If the engine does not start
If you did not move the Master Control
lever to warm start n quickly enough
after the engine began to fire, the
combustion chamber is flooded.
N Squeeze the throttle trigger and
move the Master Control lever to
cold start l .
N Slide the lock to the rear.
N Pull the shroud off to the rear.
MS 171, MS 181, MS 181 C, MS 211, MS 211 C
N Pull off the spark plug boot.
N Unscrew and dry off the spark plug.
N Move the Master Control lever to 0
N Crank the engine several times with
the starter to clear the combustion
chamber.
N Refit the spark plug. Connect the
spark plug boot and reassemble all
other parts.
N Set Master Control lever to n –
even if the engine is cold.
N Now start the engine.
If fuel tank has been run completely
dry and then refueled
N Machines with easy start system:
Press the fuel pump bulb several
times.
N Start as described for a cold engine
(cold start l)

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.
Do not make the mixture leaner to
achieve an apparent increase in
power – this could damage the
engine – see "Adjusting the
Carburetor".
Always disengage chain brake
before accelerating the engine.
Running the engine at high revs
with the chain brake engaged
(chain locked) will quickly damage
the engine and chain drive (clutch,
chain brake).
During Operation
Check chain tension frequently
A new chain has to be retensioned more
often than one that has been in use for
some time.
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