© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
8. Inspect Air Filter 9. Inspect Air Filter Housing
Remove cover and the top
of the filter is the clean side
There should not be dirt or
debris on this side of the
filter or down in the throat of
the air intake
Remove the filter and the
bottom side is the dirty side
There should be a pinch
mark all the way around the
edge of the filter to seal it
Verify that the housing is not
cracked or damaged
© STIHL Inc., Virginia Beach, VA 2013 US/STR
confidential
10. Carburetor Mixture Screws
Most STIHL products have
mixture adjustment screws on
the carburetor and will be
equipped with a limiter cap on
the H mixture screw and may
have one on the L screw also
The limiter cap allows the
operator to adjust the carb
leaner only to compensate
for operation in high
altitude
If a cap is missing it should
be considered as a fault and
it is possible the screw may
be set too lean
L mixture screw with
cone to guide the
screwdriver in place
H mixture screw
with limiter cap in
the up, or released
position to allow the
technician to make
adjustments
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