97
MS 661, MS 661 C-M
13.
Fuel System
13.1
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,
3.6,
– Remove the filter cover
– Remove the air filter.
– Check the air filter and clean or
replace if necessary – see
owner's manual.
– Reassemble in the reverse
sequence.
13.2
Baffle
– Remove the air filter,
:
Remove the baffle (1).
– Check the baffle and replace if
necessary.
1
1166RA219 TG
Installing
:
Push the baffle (1) into position
so that the stub (arrow) engages
the opening in the filter base and
the locking tab (1) snaps into
place.
– Reassemble all other parts in the
reverse sequence.
13.3
Filter Base
– Remove the baffle,
:
Unscrew the nuts (1).
To reduce the risk of dirt particles
getting into the intake port, set
switch shaft (2) to cold start – set it
to
}
on M-Tronic machines.
:
Remove the filter base (3) from
the studs.
1
1166RA302 TG
1
1
3
1166RA303 TG
2
Installing
Make sure the sleeve (1) is in place.
:
Set the switch lever (1) to cold
start.
– Use STIHL press fluid to make
installation easier,
:
Fit filter base (2) over the studs
(arrows) and push it home until it
is seated in the carburetor's
sleeve.
:
Fit the nuts (3) and tighten them
down firmly.
– Reassemble all other parts in the
reverse sequence.
1
1166RA304 TG
1166RA305 TG
2
3
3
1
