Instruction Manual

2
0000-GXX-A380-A0
► Press the spark plug boot (2) firmly home.
► Fit the filter cover (1).
19 Specifications
19.1 STIHL MS 661 C-M Chainsaw
–
Displacement: 91.1 cc
–
Engine power to ISO 7293: 5.4 kW (7.3 bhp)
–
Idle speed to ISO 11681: 2,900 ± 50 rpm
–
Approved spark plug: NGK BPMR7A from
STIHL
–
Electrode gap: 0.5 mm
–
Dry weight without guide bar and chain 7.3 kg
Dry weight without guide bar and chain
–
MS 661 C‑M: 7.5 kg
–
MS 661 C‑M with handle and carburetor
heating: 7.7 kg
–
Max. fuel tank capacity: 850 cc (0.85 l)
–
Max. oil tank capacity: 400 cc (0.4 l)
19.2 Chain Sprockets and Chain
Speeds
The following chain sprockets may be used:
7-tooth for 3/8"
–
Maximum chain speed according to
ISO 11681: 27.5 m/s
–
Chain speed at maximum power: 21.7 m/s
19.3 Minimum Groove Depth of
Guide Bars
The minimum groove depth depends on the pitch
of the guide bar.
–
3/8" 6 mm
19.4 Sound Values and Vibration
Values
–
Sound pressure level L
pA
measured according
to ISO 22868: 105 dB(A). The K value for the
sound pressure level is 2 dB(A).
–
Sound power level L
wA
measured according to
ISO 22868: 118 dB(A). K-value (uncertainty)
for sound power level is 2 dB(A).
–
Vibration level a
hv
measured according to
ISO 22867:
–
Handlebar: 6.9 m/s². The K value for the
vibration level is 2 m/s².
–
Control handle: 5.6 m/s². The K value for
the vibration level is 2 m/s².
For information on compliance with Employers'
Vibration Directive 2002/44/EC see
www.stihl.com/vib.
19.5 REACH
REACH is an EC regulation and stands for the
Registration, Evaluation, Authorisation and
Restriction of Chemical substances.
For information on compliance with the REACH
regulation see www.stihl.com/reach.
19.6 Exhaust Emissions
The CO
2
value measured in the EU type approval
procedure is specified at www.stihl.com/co2.
The measured CO
2
value was determined on a
representative engine in accordance with a
standardized test procedure under laboratory
conditions and does not represent either an
explicit or implied guarantee of the performance
of a specific engine.
The applicable exhaust emission requirements
are fulfilled by the intended usage and mainte‐
nance described in this instruction manual. The
type approval expires if the engine is modified in
any way.
20 Bar and Chain Combinations
20.1 STIHL MS 661 C-M Chainsaw
Pitch Drive link
gauge/groove
width
Length Guide Bar Nose
sprocket
teeth
Number of
drive links
Saw chain
3/8” 1.6 mm 45 cm
Duromatic - 66
36 RM (Type
3652)
36 RS (Type
3621)
Rollomatic E
Rollomatic ES
11 66
36 RM (Type
3652)
19 Specifications English
0458-759-0121-D. VA0.A21. 27