Instruction Manual

MS 661 C-M
English
45
EPA / CEPA
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category
Engine
STIHL single cylinder two-stroke engine
Ignition system
Electronic magneto ignition
(breakerless)
This ignition system fulfils all
requirements of the Canadian
Interference-Causing Equipment
Regulations ICES
-
002.
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
The actual cutting length can be less
than the specified cutting length.
STIHL cutting attachments complying
with CSA Standard Z 62.3:
Rollomatic E guide bars
Rollomatic ES guide bars
Rollomatic ES Light guide bars
Saw chains 3/8"
Chain sprocket
Specifications
A = 300 hours
B = 125 hours
C = 50 hours
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: 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 VW with handle
and carburettor heating 7.6 kg
MS 661 C-M R VW with loop
handle and carburettor heating 7.8 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)