Fuel System; Air Filter; Baffle; Filter Base - Stihl MS 661 Manual

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,
b 3.6, b 3.7
– 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, b 13.1
1
: Remove the baffle (1).
– Check the baffle and replace if
necessary.
MS 661, MS 661 C-M
Installing
1
: 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, b 13.2
3
1
2
: 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.
Installing
1
Make sure the sleeve (1) is in place.
2
3
1
: Set the switch lever (1) to cold
start.
– Use STIHL press fluid to make
installation easier, b 16
1
: 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.
3
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