FS 160, FS 220, FS 280, FS 290
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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".
If there is a noticeable loss of engine 
power
N Turn the choke knob to g (choke 
shutter closed).
N Loosen the nuts (1).
N Remove the carburetor box 
cover (2).
N Remove the felt mat (3) and air 
filter (4).
N Knock out the felt mat or blow it 
clear – if heavily loaded with dirt, fit 
a new one. 
N Wash the air filter in a clean, non-
flammable solution (warm soapy 
water) and shake it out thoroughly.
N Replace damaged parts of the air 
filter.
N Install the air filter and felt mat.
N Fit the carburetor box cover and 
secure it in position.
Operating Instructions Cleaning the Air Filter