Operating Instructions; Replacing The Air Filter - Stihl MM 55 Instruction Manual

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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".
14

Replacing the Air Filter

If there is a noticeable loss of engine
power
2
1
Set choke lever to g
N
Remove screw (1)
N
Remove filter cover (2)
N
Remove coarse dirt from inside the
N
filter cover and around the filter
4
3
Remove the air filter (3)
N
Check the air filter – replace if
N
necessary
NOTICE
Replace any damaged parts.
Insert air filter (3) in the filter
N
housing (4)
Refit the filter cover and screw it
N
down
MM 55