Stihl MS 661 C-M User Manual

28 MS 661, MS 661 C-M
6.4 Shroud
– Remove the filter cover and pull
off the spark plug boot.
: Unscrew the slotted nut (1) and
remove the shroud (2).
: Check the grommet (1) and
stud (2), replace if necessary.
Installing
If the stud has been removed:
– Use two locked nuts to screw
home the stud and tighten it down
firmly.
– Coat grommet with STIHL press
fluid and fit its small diameter
over the stud's washer, b 16
2
1166RA052 TG
1
2
1166RA053 TG
1
: Position the shroud (1) so that
the ignition lead (2) locates in the
guide and the pegs (arrows)
engage the holes.
– Fit the slotted nut and tighten it
down firmly.
– Reassemble all other parts in the
reverse sequence.
6.5 Cylinder
Before removing the cylinder,
decide whether or not the
crankshaft has to be removed as
well.
Cylinder installed
To remove the flywheel and clutch,
the crankshaft has to be blocked by
inserting the locking strip in the
spark plug hole, b 4.2.
Cylinder removed
To remove the flywheel and clutch,
the crankshaft has to be blocked by
resting the piston on the piston
support (special tool).
– Remove the shroud, b 6.4
– Remove the rewind starter,
b 9.2
– Remove the filter base, b 13.3
– Remove the carburetor, b 13.4
– Remove the muffler, b 6.1
– Remove the decompression
valve, b 6.9
1
2
1166RA054 TG
– Remove AV element from
handlebar, b 10.4
: Remove the washer (1) and
sleeve (2).
– Push out the manifold flange in
the direction of the cylinder.
: Take out the cylinder base
screws through the holes
(arrows).
: Carefully lift the cylinder (1)
away, guiding the manifold
flange (2) past the tank housing
at the same time.
2
1
1166RA055 TG1166RA056 TG
1
1166RA057 TG
2

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