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16 Operating Instructions
NOTICE
Always disengage chain brake before accelerat‐
ing the engine. High revs with the chain brake
engaged (chain locked) will quickly damage the
clutch and chain brake.
15.8
At very low outside tempera‐
tures
► Allow engine to warm up at part throttle.
15.9
Stopping the Engine
► Move the Master Control lever to the stop
position (0).
15.10 If the engine does not start
► Check that all settings are correct.
► Check that there is fuel in the tank and refuel if
necessary.
► Check that the spark plug boot is properly con‐
nected.
► Repeat the starting procedure.
or:
It is possible that the fuel-air mixture in the com‐
bustion chamber is over-rich and has flooded the
engine.
► Remove the spark plug – see "Spark Plug".
► Dry the spark plug.
► Move the Master Control lever to the stop
position (0).
► Crank the engine several times with the starter
to clear the combustion chamber.
► Install the spark plug – see "Spark Plug".
► Set Master Control lever to n – even if the
engine is cold.
► Now start the engine.
16 Operating Instructions
16.1
During the 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 unnecessarily high loads dur‐
ing the break-in period. As all moving parts have
to bed in during the break-in period, the frictional
resistances in the shortblock are greater during
this period. The engine develops its maximum
power after about 5 to 15 tank fillings.
0458-567-0121-B
16.2
During work
NOTICE
Do not make the mixture leaner to achieve an
apparent increase in power – this could damage
the engine – see "Adjusting the Carburetor".
NOTICE
Open the throttle only when the chain brake is
off. Running the engine at high revs with the
chain brake engaged (chain locked) will quickly
damage the shortblock and chain drive (clutch,
chain brake).
16.2.1
Check chain tension frequently
A new saw chain must be retensioned more fre‐
quently than one that has been in use already for
an extended period.
16.2.2
Chain cold
Tension is correct when the chain fits snugly
against the underside of the bar but can still be
pulled along the bar by hand. Retension if neces‐
sary – see "Tensioning the Saw Chain".
16.2.3
Chain at operating temperature
The chain stretches and begins to sag. The drive
links must not come out of the bar groove on the
underside of the bar – the chain may otherwise
jump off the bar. Retension the chain – see "Ten‐
sioning the Saw Chain".
NOTICE
The chain contracts as it cools down. If it is not
slackened off, it can damage the crankshaft and
bearings.
16.2.4
After a long period of full-throttle oper‐
ation
After a long period of full-throttle operation, allow
engine to run for a while at idle speed so that the
heat in the engine can be dissipated by flow of
cooling air. This protects engine-mounted com‐
ponents (ignition, carburetor) from thermal over‐
load.
16.3
After finishing work
► Slacken off the chain if you have retensioned it
at operating temperature during work.
English
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