FS 40, FS 40 C, FS 50, FS 50 C
English
25
If there is a noticeable loss of engine 
power
N Move the choke lever (1) to <.
N Turn the screw (2) in the filter 
cover (3) counterclockwise until the 
cover is loose.
N Ease the filter cover (3) over the 
choke lever and lift it away.
N Clean away loose dirt from around 
the filter.
N Reach into the recess (4) in the filter 
housing and take out the felt 
filter (5).
N Fit a new felt filter element (5). As a 
temporary measure you can knock it 
out on the palm of your hand or blow 
it out with compressed air. Do not 
wash.
NOTICE
Replace damaged parts.
N Fit the felt filter (5) in the filter 
housing, make sure it is properly 
seated – the arrow points to the 
recess.
N Move the choke lever (1) to <.
N Fit the filter cover in position, 
making sure the screw is square. 
Tighten down the screw.
Exhaust emissions are controlled by the 
design of the fundamental engine 
parameters and components (e.g. 
carburation, ignition, timing and valve or 
port timing) without the addition of any 
major hardware.
Cleaning the Air Filter
Engine Management