FS 240, FS 240 R
English
35
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".
General Information
The filter has a very long service life. 
Do not remove the filter cover or replace 
the air filter as long as there is no 
noticeable loss of power.
Dirty air filters reduce engine power, 
increase fuel consumption and make 
starting more difficult.
Replacing the Air Filter
Only if there is a noticeable loss of 
engine power
N Set the choke lever to g.
N Loosen the screws (1).
N Remove the filter cover (2).
N Clean away loose dirt from around 
the filter (3) and inside the filter 
cover.
The air filter (3) is a pleated paper filter 
element.
N Remove and check the filter 
element (3) – replace if paper or 
frame is dirty or damaged.
N Unpack the new filter.
NOTICE
Do not bend or twist the filter before 
installation as it might otherwise be 
damaged – do not use damaged filters.
N Fit the filter in the filter housing.
N Fit the filter cover.
Use only high quality air filters to ensure 
the engine is protected from abrasive 
dust.
STIHL recommends you use only 
original STIHL air filters. The high quality 
standard of these parts guarantees 
trouble-free operation, a long engine life 
and very long filter service lives.
Operating Instructions Air filter