Instruction Manual

MS 660
English
53
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
MS 660
Ignition System
Electronic (breakerless) magneto
ignition
Fuel System
All position diaphragm carburetor with
integral fuel pump
Chain Lubrication
Fully automatic, speed-controlled oil
pump with rotary piston. Additional
manual oil flow control
Weight
Cutting Attachment
Recommended cutting attachments
complying with Section 5.11 of
ANSI/OPEI B 175.1-2012
Observe notes on ANSI/OPEI B
175.1-2012 and definition of "low
kickback chain" in chapter on "Safety
Precautions and Working Techniques".
Rollomatic E guide bars
3/8" chains
Chain sprocket
To ensure compliance with the kickback
properties required in Section 5.11 of
ANSI B 175.1-2000, only use
replacement chains that, when used
with this specific powerhead, comply
Specifications
A = 300 hours
B = 125 hours
C = 50 hours
Displacement: 5.6 cu. in.
(91.6 cm
3)
Bore: 2.13 in. (54 mm)
Stroke: 1.57 in. (40 mm)
Engine power to ISO
7293:
7.0 hp (5.2 kW)
bei 9,500 rpm
Idle speed: 2,500 rpm
High speed setting
when performing
repairs (with bar and
chain): 13,500 rpm
Spark plug (resistor
type):
NGK BPMR 7 A,
Bosch WSR 6 F
Electrode gap: 0.02 in (0.5 mm)
Fuel tank capacity: 27.9 fl.oz (0.825 l)
Oil tank capacity: 12.2 fl.oz (0.36 l)
dry, without bar and chain
MS 660: 16.5 lbs. (7.5 kg)
MS 660 with wrap-
around handle: 16.8 lbs. (7.6 kg)
Reduced kickback STIHL guide bar
(with green label)
Cutting lengths: 20, 25, 28, 32 or
36 in (50, 63, 70, 80
or 90 cm)
Pitch: 3/8" (9.32 mm)
Groove width: 0.050 in (1.3 mm)
Nose sprocket: 10-tooth
Reduced kickback STIHL guide bar
(with green label)
Cutting lengths: 20, 22, 25, 28, 32 or
36 in (50, 55, 63, 70,
80 or 90 cm)
Pitch: 3/8" (9.32 mm)
Groove width: 0.063 in (1.6 mm)
Nose sprocket: 10-tooth
Low kickback STIHL saw chain (with
green label)
Rapid Super 3 (33 RS3) Type 3624
Pitch: 3/8" (9.32 mm)
Drive link gauge: 0.050 in (1.3 mm)
Low kickback STIHL saw chain (with
green label)
Rapid Super 3 (36 RS3) Type 3626
Pitch: 3/8" (9.32 mm)
Drive link gauge: 0.063 in (1.6 mm)
7-tooth for 3/8" (rim sprocket)