Operating Instructions; Cleaning The Air Filter - Stihl FS 90 Instruction Manual

Swing wire rod outwards.
N
Fit transport guard on saw blade
N
from below, making sure the limit
stop is properly seated in the
recess.
Swing wire rod into position.
N
Hook wire rod to the transport
N
guard.
FS 90, FS 90 R

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
2.
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".

Cleaning the Air Filter

If there is a noticeable loss of engine
power
4
Turn the choke knob to g
N
Take out the screw (1) and remove
N
the filter cover (2).
Clean away loose dirt from around
N
the filter.
Grip the filter element (3) at the
N
cutout (arrow) in the filter
housing (4) and remove it.
Fit a new filter element. As a
N
temporary measure you can knock it
out on the palm of your hand or blow
it out with compressed air. Do not
wash.
Replace damaged parts.
N
Installing the filter
Install the filter element in the filter
N
housing and fit the cover.
Insert the screw and tighten it down
N
firmly.
English
1
2
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