Specifications - Stihl MS 661 C-M Instruction Manual

Specifications

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
A = 300 hours
B = 125 hours
C = 50 hours
Engine
STIHL single cylinder two-stroke engine
Displacement: 5.56 cu. in.
(91.1 cm
Cylinder bore: 2.20 in. (56 mm)
Piston stroke: 1.46 in. (37 mm)
Engine power
according to 7.2 bhp (5.4 kW)
ISO 7293: at 9,500 rpm
Idle speed: 2,800 rpm
Maximum speed
with bar and chain: 13,500 rpm
Ignition system
Electronic magneto ignition
Spark plug Bosch WSR 6 F,
(suppressed): NGK BPMR 7 A
Electrode gap: 0.02 in. (0.5 mm)
MS 661 C-M
Fuel system
All position diaphragm carburettor with
integral fuel pump
Fuel tank capacity:
Chain lubrication
Fully automatic, speed-controlled oil
pump with reciprocating piston-
additional manual oil flow control
Oil tank capacity:
Weight
Dry, without cutting attachment
MS 661 C-M:
MS 661 C-M with loop
handle
Cutting Attachments
3
)
Recommended cutting attachments
conforming with the 45 degree
computed kickback angle requirement
of Section 5.11 of
ANSI/OPEI B175.1-2012 when used on
this model chain saw (see the chapter
on "Safety Precautions and Working
Techniques"):
Rollomatic E guide bars
Reduced kickback STIHL guide bars
(with green label)
Bar lengths:
28.7 oz (0.85 l)
Pitch:
Groove width: 1.3 mm (0.050 in) or
Sprocket nose: 10-tooth for cutting
13.5 oz (0.325 l)
Actual cutting length will be less than
listed bar length.
Rollomatic ES guide bars
16.5 lbs. (7.5 kg)
Reduced kickback STIHL guide bars
(with green label)
16.8 lbs. (7.6 kg)
Bar lengths:
Pitch:
Groove width: 1.3 mm (0.050 in) or
Sprocket nose: 10-tooth for cutting
Actual cutting length will be less than
listed bar length.
English
40, 45, 50, 63 cm (16,
18, 20, 25 in.)
3/8" (9.32 mm)
1.6 mm (0.063 in.)
lengths 40, 45, 50 cm
(16, 18, 20 in.), 11-tooth
for cutting lengths 40,
45, 50, 63 cm (16, 18,
20, 25 in.)
40, 45, 50, 63, 71 cm
(16, 18, 20, 25, 28 in.)
3/8" (9.32 mm)
1.6 mm (0.063 in.)
length 63 cm (25 in.),
11-tooth for cutting
lengths 40, 45, 50, 63,
71 cm (16, 18, 20, 25,
28 in.)
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