Stihl 064 Service Manual page 76

STIHL 064, 066
11. FUEL SYSTEM
11.1 Air Filter
1 = Carburetor box cover
2 = Twist lock
3 = Master Control lever
The air filter's function is to remove dust
and dirt sucked in with the combustion air
and thus help reduce wear on engine
components to a minimum.
Dirty and clogged air filters reduce engine
power, increase fuel consumption and
make starting more difficult.
The air filter should always be cleaned
when engine power begins to drop off.
In machines with digital ignition the
carburetor with compensator keeps the
fuel content in the mixture constant at all
times, irrespective of how dirty the filter is
- see also 11.2.
- Before removing the air filter, close the
choke shutter to prevent dirt falling into
the carburetor.
- Take off the carburetor box cover.
Top:
Removing outer filter element
Bottom:
1 = Inner filter element
2 = Slotted nuts
3 = Baffle
- Pull off the outer filter element.
- Remove the slotted nuts and pull
away the baffle and inner filter
element.
- Thoroughly wash the two ele-
ments in afresh, non-inflamm-
able cleaning solution (e.g. warm
soapy water). Carefully shake
dry. Encrusted dirt should be
softened by immersing the filter
in the cleaning solution.
Top:
Open connector on inner filter element
Bottom:
O-ring on baffle
Note: If the filter fabric is dam-
aged, replace the part concerned
immediately.
Installation is a reversal of the
removal sequence.
Note: Only inner filter elements
with an open connector may be
installed in models with compen-
sator carburetors.
Fit a new O-ring on the stub of the
baffle.
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