Stihl MS 661 C-M User Manual

23MS 661, MS 661 C-M
: Fit the O-ring in the spur gear
recess (arrow).
– Clean all disassembled parts,
b 16
– Lubricate the threads, gears and
O-ring with STIHL grease, b 16
– Reassemble in the reverse
sequence.
5.7 Bar Mounting Studs
– Remove the side plate, b 5.2
– Use stud puller 5910 893 0501 to
unscrew collar studs from
crankcase.
: Before installing, coat the
threads (1) of the collar studs
with threadlocking adhesive,
b 16
: Use stud puller (2)
5910 890 0501 to fit and tighten
down the collar studs (1).
3443RA466 TG
1166RA027 TG
1
2
1
– Reassemble all other parts in the
reverse sequence.
5.8 Collar Nuts for Sprocket
Cover
Use special tool 5910 893 9601 to
replace the nuts.
– Remove the chain sprocket
cover.
: Screw the short stud
(marked "S") of special tool (1)
5910 893 9601 into the collar
nut (2) as far as stop.
– Turn the sprocket cover over and
clamp the special tool's hexagon
in a vise.
: Use an 11mm drill to drill away
the flange of the captive nuts –
the shoulder in the sprocket
cover must not be drilled out.
1166RA028 TG
12
2
1166RA029 TG
– Remove the collar nuts.
– Unscrew the special tool from the
collar nuts.
Installing
: Push the new collar nuts (1) into
position.
– Hold hexagon of collar nuts
steady.
: Screw the long stud (marked "L")
of special installing tool (1)
5910 893 9601 into the collar
nuts from the other side as far as
stop.
This flares the ends of the new
collar nuts and secures them in the
sprocket cover.
– Reassemble all other parts in the
reverse sequence.
1166RA030 TG
1
1
1
1166RA031 TG

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