Metering Diaphragm - Stihl MS 441 Manual

: Examine a soiled air flap and the
surrounding area, clean with
a little commercially available
solvent-based degreasant not
containing any chlorinated or
halogenated hydrocarbons if
necessary, taking care not to
damage the air flap.
Setting of throttle shutter
(throttle trigger position) / air flap
The correct setting of the air flap
can be visually checked as follows.
– Throttle shutter in idle position –
air flap fully closed.
– Throttle shutter in idle position to
full throttle – air flap closed to fully
1)
open .
– Throttle shutter in full throttle
position – air flap fully open
– Throttle shutter during cold
start l – air flap fully closed
– Throttle shutter during warm
start k – air flap open approx.
10°
1)
Air flap must move in both
directions (open and closed) and
must always return to its starting
position.
– Reassemble in the reverse
sequence.
MS 441, MS 441 C

14.4.2 Metering diaphragm

– Remove carburetor, b 14.3.
: Take out screws (arrows).
1)
.
Machines with handle heating
: Remove switch (1).
: Remove cover (1).
If gasket and diaphragm stick to
carburetor parts, they must be
detached with great care.
1
: Carefully detach metering
diaphragm (1) from gasket (2).
The diaphragm material is
subjected to continuous alternating
stresses and eventually shows
signs of fatigue, i.e. the diaphragm
distorts and swells and has to be
replaced.
– Examine metering diaphragm for
signs of damage and wear,
1
replace gasket.
1
2
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