Stihl MS 661 C-M Installation, Operation & Maintenance Manual

MS 661 C-M
English
26
Chain scabbard
Your saw comes standard with a chain
scabbard that matches the cutting
attachment.
If you use guide bars of different lengths
on the saw, the length of the chain
scabbard must be matched to the guide
bar to reduce the risk of injury. It should
cover the full length of the guide bar.
The length of the matching guide bars is
marked on the side of the chain
scabbard.
Chain scabbard extensions
One chain scabbard extension is
required for guide bars longer than
35.4 in (90 cm). Two extensions are
required for guide bars longer than
47.2 in (120 cm).
Depending on original equipment, the
chain scabbard extension either comes
with the machine or is available as a
special accessory.
Fitting chain scabbard extension
N Push the chain scabbard
extension (1) and chain
scabbard (2) together, making sure
the locking tabs (3) engage in the
chain scabbard
N If more than one chain scabbard
extension is required, push the
second chain scabbard extension
and the first chain scabbard
extension together, making sure the
locking tabs (3) engage in the first
chain scabbard extension
Removing the chain sprocket cover
N Turn the captive nuts to the left until
it hangs loosely in the chain
sprocket cover
N Remove chain sprocket cover and
captive nuts
N Turn screw (1) to the left until the
tensioner slide (2) butts against the
left end of the housing slot
001BA244 KN
001BA249 KN
3
31 2
001BA250 KN
3
3
Mounting the Bar and Chain
1166BA039 KN
1
2
001BA185 KN

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