Stihl MS 241 C-M Instruction Manual - Page 39

Operating Instructions

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At very low temperatures N Let the engine warm up briefly with the throttle slightly open N if necessary, configure for winter operation, see "Winter Operation" Switching off the engine N Move the master control lever to the stop position 0 If the engine does not start The starter grip may not have been pulled briskly and forcefully enough; the engine is probably flooded. N Move the Master Control lever to run F N Hold and start the chain saw or: N Remove the spark plug - see "Spark plug" N Dry the spark plug N Move the master control lever to the stop position 0 N Crank the engine several times with the starter - to clear the combustion chamber N Replace the spark plug - see "Spark plug" N Move the Master Control lever to run F N Hold and start the chain saw Operating Instructions 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 during 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. During work 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 engine and chain drive (clutch, chain brake). Check chain tension frequently A new saw chain must be retensioned more frequently than one that has been in use already for an extended period. 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 necessary - see "Tensioning the Saw Chain". English 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 "Tensioning the Saw Chain". NOTICE The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings. After a long period of full-throttle operation 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 enginemounted components (ignition, carburetor) from thermal overload. After finishing work N Slacken off the chain if you have retensioned it at operating temperature during work. NOTICE Always slacken off the chain again after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings. Short-term storage Wait for engine to cool down. Keep the machine with a full tank of fuel in a dry place, well away from sources of ignition, until you need it again. MS 241 C-M 37

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MS 241 C-M
English
37
At very low temperatures
N
Let the engine warm up briefly with
the throttle slightly open
N
if necessary, configure for winter
operation, see "Winter Operation"
Switching off the engine
N
Move the master control lever to the
stop position
0
If the engine does not start
The starter grip may not have been
pulled briskly and forcefully enough; the
engine is probably flooded.
N
Move the Master Control lever to
run
F
N
Hold and start the chain saw
or:
N
Remove the spark plug - see "Spark
plug"
N
Dry the spark plug
N
Move the master control lever to the
stop position
0
N
Crank the engine several times with
the starter – to clear the combustion
chamber
N
Replace the spark plug – see "Spark
plug"
N
Move the Master Control lever to
run
F
N
Hold and start the chain saw
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 during 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.
During work
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
engine and chain drive (clutch, chain
brake).
Check chain tension frequently
A new saw chain must be retensioned
more frequently than one that has been
in use already for an extended period.
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 necessary – see
"Tensioning the Saw Chain".
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
"Tensioning the Saw Chain".
NOTICE
The chain contracts as it cools down. If it
is not slackened off, it can damage the
crankshaft and bearings.
After a long period of full-throttle
operation
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 components (ignition,
carburetor) from thermal overload.
After finishing work
N
Slacken off the chain if you have
retensioned it at operating
temperature during work.
NOTICE
Always slacken off the chain again after
finishing work. The chain contracts as it
cools down. If it is not slackened off, it
can damage the crankshaft and
bearings.
Short-term storage
Wait for engine to cool down. Keep the
machine with a full tank of fuel in a dry
place, well away from sources of
ignition, until you need it again.
Operating Instructions