Stihl MS 661 C-M, 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