Stihl MS 661 C-M User Manual

30 MS 661, MS 661 C-M
: Fit the new cylinder gasket (1)
over the piston and position it so
that the contour (arrow) and
tab (2) are at the clutch side.
: Hold the piston support (1)
5910 893 5300 so that the
recesses (arrows) engage the
flange and then push it between
the piston and crankcase.
Take care not to damage the
cylinder gasket.
1
1166RA061 TG
2
1166RA062 TG
1
– Lubricate the piston, piston rings
and cylinder wall with oil, b 16
– Check correct installed position
of rings, b 6.8
: Use the clamping strap (1)
0000 893 2600 to compress the
rings around the piston.
Apply the clamping strap (1) so that
the piston rings do not project
beyond the cylinder wall.
: Position the cylinder (1) so that
the manifold (2) points towards
the tank housing.
While sliding the cylinder over the
piston, hold the clamping strap
tightly around the piston so that the
rings do not project
– they might otherwise break.
: Slide the cylinder over the piston,
the clamping strap moves
downwards at the same time.
1166RA063 TG
1
1
1166RA064 TG
2
– Remove the clamping strap and
piston support.
: Wind a piece of string (1) around
the manifold flange and pass the
ends of the string through the
opening in the tank housing.
Make sure the cylinder gasket is
properly seated.
: Push home the cylinder (2) as far
as stop and position the manifold
flange (3) against the tank
housing – take care not to
displace or damage the washer in
the manifold.
: Insert the screws (1) to hold the
cylinder and gasket in position.
: Tighten down the screws (1)
through the holes (arrows) in the
cylinder in a crosswise pattern.
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1166RA065 TG
2
3
1166RA066 TG
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