Instruction Manual

MS 661 C-M
English
44
Engine
STIHL single cylinder two-stroke engine
Ignition system
Electronic magneto ignition
(breakerless)
Fuel system
All position diaphragm carburettor with
integral fuel pump
Chain lubrication
Fully automatic, speed-controlled oil
pump with reciprocating piston -
additional manual oil flow control
Weight
Cutting Attachment
Actual cutting length may be less than
the specified length
Rollomatic E guide bars
Rollomatic ES guide bars
Rollomatic ES Light guide bars
Saw chains 3/8"
Chain sprocket
Sound and vibration levels
For further details concerning
compliance with the Physical Agents
Directive Vibration 2002/44/EC, see
www.stihl.com/vib/
Sound pressure level L
peq
to ISO 22868
Sound power level L
w
to ISO 22868
Vibration level a
hv,eq
to ISO 22867
The K-factor in accordance with
Directive 2006/42/EC is 2.0 dB(A) for
the sound pressure level and sound
power level; the K-factor in accordance
with Directive 2006/42/EC is 2.0 m/s
2
for the vibration level.
Specifications
Displacement: 91.1 cm
3
Cylinder bore: 56 mm
Piston stroke: 37 mm
Engine power
according to
ISO 7293:
5.4 kW (7.3 HP)
at 9500 rpm
Idle speed:
1)
1)
to ISO 11681 +/- 50 rpm
2800 rpm
Spark plug
(suppressed):
Bosch WSR 6 F,
NGK BPMR 7 A
Electrode gap: 0.5 mm
Fuel tank capacity: 850 cm
3
(0.85 l)
Oil tank capacity: 400 cm
3
(0.4 l)
Dry, without cutting attachment
MS 661 C-M 7.4 kg
MS 661 C-M with handle
heating 7.5 kg
Cutting lengths: 40, 45, 50, 63 cm
Pitch: 3/8"
Groove width: 1.6 mm
Sprocket nose: 10-tooth with cutting
lengths 40, 45,
50 cm
11-tooth with cutting
lengths 40, 45, 50,
63 cm
Cutting lengths: 40, 45, 50, 55, 71,
75, 80, 90 cm
Pitch: 3/8"
Groove width: 1.6 mm
Sprocket nose: 11-tooth
Cutting lengths: 71, 80, 90 cm
Pitch: 3/8"
Groove width: 1.6 mm
Sprocket nose: 11-tooth
Rapid Micro (36 RM) Type 3652
Rapid Super (36 RS) Type 3621
Rapid Super 3 (36 RS3) Type 3626
Pitch: 3/8" (9.32 mm)
Drive link gauge: 1.6 mm
7-tooth for 3/8" (rim sprocket)
Max. chain speed to
ISO 11681: 27.5 m/s
Chain speed at maximum
power output: 21.7 m/s
105 dB(A)
118 dB(A)
Left handle: 6.9 m/s
2
Right handle: 5.6 m/s
2