Stihl MS 311 Manual

68 MS 311, MS 391
12. Fuel System
12.1 Air Filter
Dirty air filters reduce engine power,
increase fuel consumption and
make starting more difficult. The air
filter should be checked when there
is a noticeable loss of engine power.
– See also Troubleshooting,
b 3.6, b 3.7
– Remove the shroud, b 6.4
: Lift the retaining tab (1) a little
and remove the air filter (2).
– Check the air filter and clean or
replace if necessary
– see instruction manual.
– Reassemble in the reverse
sequence.
4903RA204 TG
1
2
12.2 Baffle
– Remove the air filter, b 12.1
: Unscrew the nuts (arrows).
– Remove the baffle (1).
– Reassemble in the reverse
sequence.
12.3 Filter Base
– Remove the air filter, b 12.1
– Remove the baffle, b 12.2
– Remove the choke rod,
b 10.2.1
– Disconnect the ground wire from
the contact spring, b 7.7.4.
4903RA205 TG
1
: Pull the short circuit wire (1) out
of the guides (arrows).
– Pull the ring terminal off the pivot
pin (2).
: Pull the filter base (1) out of
rubber buffer (3) first and then
rubber buffer (2).
: Remove the filter base (1).
4903RA101 TG
1
2
4903RA207 TG
1
3
2

Stihl MS 311 Specifications

General

Oil tank capacity	0.348 L
Fuel tank capacity	0.6 L
Power source	Gasoline

Weight and Dimensions

Weight	6200 g