Specifications - Stihl MS 661 Instruction Manual

Specifications

Engine
STIHL single cylinder two-stroke engine
Displacement: 91.1 cm
Cylinder bore: 56 mm
Piston stroke: 37 mm
Engine power
according to 5.4 kW (7.3 HP)
ISO 7293: at 9500 rpm
1)
Idle speed: 2800 rpm
1)
according to ISO 11681 +/- 50 rpm
Ignition system
Electronic magneto ignition
Spark plug Bosch WSR 6 F,
(suppressed): NGK BPMR 7 A
Electrode gap: 0.5 mm
Fuel system
All position diaphragm carburettor with
integral fuel pump
Fuel tank capacity: 850 cm
Chain lubrication
Fully automatic, speed-controlled oil
pump with reciprocating piston -
additional manual oil flow control
Oil tank capacity: 400 cm
MS 661
Weight
Dry, without cutting attachment
MS 661:
Cutting attachment
3
Rollomatic E guide bars
Cutting lengths:
Pitch:
Groove width:
Sprocket nose:
Rollomatic ES guide bars
Cutting lengths:
Pitch:
Groove width:
Sprocket nose:
Rollomatic ES Light guide bars
Cutting lengths:
Pitch:
3
(0.85 l)
Groove width:
Sprocket nose:
3
(0.4 l)
Saw chains 3/8"
Rapid Micro (36 RM) Type 3652
Rapid Super (36 RS) Type 3621
7.4 kg
Rapid Super 3 (36 RS3) Type 3626
Pitch:
Drive link gauge:
Chain sprocket
7-tooth for 3/8" (rim sprocket)
40, 45, 50, 63 cm
Max. chain speed to
3/8"
ISO 11681:
1.6 mm
The average chain speed during
10-tooth with cutting
operation is normally approx. 20% less
lengths 40, 45,
than the maximum chain speed to
50 cm
ISO 11681. Contact the STIHL dealer
11-tooth with cutting
when selecting the personal protective
lengths 40, 45, 50,
equipment.
63 cm
Sound and vibration levels
40, 45, 50, 55, 71,
For further details concerning
75, 80, 90 cm
compliance with the Physical Agents
3/8"
Directive Vibration 2002/44/EC, see
1.6 mm www.stihl.com/vib/
11-tooth
Sound pressure level L
105 dB(A)
71, 80, 90 cm
Sound power level L
3/8"
1.6 mm 118 dB(A)
11-tooth
Vibration level a
Left handle:
Right handle:
The K-factor in accordance with
Directive 2006/42/EC is 2.5 dB(A) for
the sound pressure level and sound
English
3/8" (9.32 mm)
1.6 mm
27.5 m/s
to ISO 22868
peq
to ISO 22868
w
to ISO 22867
hv,eq
2
5.5 m/s
2
5.5 m/s
45