Stihl MS 310 Product Instruction Manual - Page 39

Operating Instructions

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English / USA Operating Instructions 2 : Pull off the spark plug boot (2). : Unscrew and dry off the spark plug. : Crank the engine several times with the starter to clear the combustion chamber. : Refit the spark plug and connect the spark plug boot (press it down firmly) - reassemble all other parts : Set Master Control lever to n Warm Start even if engine is cold. : Press in decompression valve. : Now start the engine. 139BA002 KN 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 Carburetor". Always disengage the chain brake before opening the throttle. Running the engine at higher revs with the chain brake engaged (saw chain at a standstill) 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. Chain cold: Tension is correct when chain fits snugly against the underside of the bar and 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 - the chain may otherwise jump off the bar. Retension the chain - see "Tensioning the Saw Chain"! Always slacken off the chain after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings. 38 MS 290, MS 310, MS 390

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38
English / USA
MS 290, MS 310, MS 390
:
Pull off the spark plug boot
(2)
.
:
Unscrew and dry off the spark plug.
:
Crank the engine several times
with the starter to clear the
combustion chamber.
:
Refit the spark plug and connect the
spark plug boot
(press it down
firmly)
– reassemble all other parts
:
Set Master Control lever to
n
Warm Start even if engine is
cold.
:
Press in decompression valve.
:
Now start the engine.
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
Carburetor”.
Always disengage the chain brake
before opening the throttle. Running
the engine at higher revs with the
chain brake engaged (saw chain at
a standstill) 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.
Chain cold:
Tension is correct when chain fits snugly
against the underside of the bar and 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 – the chain may otherwise
jump off the bar.
Retension the chain – see “Tensioning
the Saw Chain”!
Always slacken off the chain after
finishing work. The chain contracts
as it cools down. If it is not
slackened off, it can damage the
crankshaft and bearings.
139BA002 KN
2
Operating Instructions