Stihl MS 661 C-M User Manual

97MS 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,
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
: 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, b 13.2
: 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.
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, b 16
: 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 TG1166RA305 TG
2
3
3
1

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g