18.4 Adjusting the Throttle Cable
► Press the throttle trigger (1) and keep pressed.
► Turn screw (2) clockwise until resistance is
felt.
► Turn the screw (2) clockwise through another
half-turn.
19 Specifications
19.1 STIHL 491 C-M brushcutter
–
Displacement: 51.6 cm³
–
Engine power to ISO 8893: 2.4 kW (3.3 bhp)
at 9,500 rpm
–
Idle speed : 2,500 rpm
–
Max. output shaft speed: 7,100 rpm
–
Approved spark plug: NGK CMR6H from
STIHL
–
Electrode gap of the spark plug: 0.5 mm
Weight with empty fuel tank and without cut‐
ting attachment and deflector:
–
FS 491 C-M: 9.3 kg
–
FS 491 C-M L: 9.4 kg
Length without cutting attachment:
–
FS 491 C-M: 1,795 mm
–
FS 491 C-M L: 1,855 mm
–
Max. fuel tank capacity: 990 cm³ (0.99 l)
19.2 Sound Values and Vibration
Values
The K-value for sound pressure levels is 2 dB(A).
K-value for sound power levels is 2 dB(A). The
K-value for vibration level is 2 m/s².
Using with a mowing head
–
Sound pressure level L
pA
measured according
to ISO 22868: 101 dB(A).
–
Sound power level L
w
measured according to
ISO 22868: 111 dB(A)
–
Vibration level a
hv
measured according to
ISO 22867:
–
Control handle: 2.8 m/s².
–
Left handle: 3.2 m/s².
Using with a metal cutting attachment
–
Sound pressure level L
pA
measured according
to ISO 22868: 101 dB(A).
–
Sound power level L
w
measured according to
ISO 22868: 112 dB(A)
–
Vibration level a
hv
measured according to
ISO 22867:
–
Control handle: 2.8 m/s².
–
Left handle: 3.4 m/s².
For information on compliance with Employers'
Vibration Directive 2002/44/EC see
www.stihl.com/vib.
19.3 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.
19.4 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 Combinations of Cutting Attachments, Deflectors and Carrying
Systems
20.1 Combinations of Cutting Attachments, Deflectors and Carrying Systems
Cutting attachment Deflector Carrying System
–
AutoCut 46-2 mowing head
–
DuroCut 40-4 mowing head
–
SuperCut 40-2 mowing head
–
Deflector for mowing heads
–
Full harness with
quick release sys‐
tem
19 Specifications English
0458-844-0101-A 21
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