Fuel System; Air Filter - Stihl MS 290 Manual

: Hold the elbow connector (1) at
90 degrees and push it into the
pump.
– Turn the elbow connector to the
right.
: Make sure the guide lug on the
elbow connector engages the
recess in the oil pump.
Always install new O-rings.
– Lubricate the pump piston and
worm with grease before
installing, b 13.
Install all other parts in the reverse
sequence.
64
11.

Fuel System

11.1

Air Filter

Dirty air filters reduce engine power,
increase fuel consumption and
make starting more difficult.
1
The air filter should be cleaned
when there is a noticeable loss of
engine power.
– Close the choke shutter.
Machines up to 2002
: Turn the twist lock (1) 90 degrees
to the left (counterclockwise)
: Remove the carburetor box cover
to the rear.
Machines from 2002
: Turn the twist lock (1) 90 degrees
to the left (counterclockwise).
: Remove the carburetor box cover
to the rear.
1
– Remove all loose dirt from
around the filter.
: Remove the prefilter (1) upwards.
1
1
2
: Unscrew the slotted nuts (1).
: Remove the air filter (2).
1
: Insert blade of screwdriver
between the lugs.
MS 290, MS 310, MS 390
2