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SP 451, SP 481
English
27
Engine
STIHL single cylinder two-stroke engine
SP 451
SP 481
Ignition System
Electronic magneto ignition
Fuel System
All position diaphragm carburetor with
integral fuel pump
Weight
Hook
Length
Noise and Vibration Data
Noise measurements include idling and
rated maximum speed, vibration
measurements idling and full load with
the same duration of exposure in each
case.
For further details on compliance with
Vibration Directive 2002/44/EC see
www.stihl.com/vib/
Tool: Hook
Sound pressure level L
peq
to
ISO 11201
Sound power level L
weq
to ISO 3744
Vibration measurement a
hv,eq
to
ISO 20643
The K-factor in accordance with
Directive 2006/42/EC is 2.5 dB(A) for
the sound pressure level and sound
power level; the K-factor in accordance
with Directive 2006/42/EC is 2.0 m/s
2
for the vibration measurement.
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 (EC) No. 1907/2006
see www.stihl.com/reach.
Specifications
Displacement:
44.3 cm
3
Bore:
42 mm
Stroke:
32 mm
Engine power to
ISO 8893:
2.1 kW (2.9 HP)
at 9,000 rpm
Cut-off speed
(rated):
12,500 rpm
Idle speed:
2,800 rpm
Displacement:
48.7 cm
3
Bore:
44 mm
Stroke:
32 mm
Engine power to
ISO 8893:
2.2 kW (3.0 HP)
at 9,000 rpm
Cut-off speed
(rated):
12,500 rpm
Idle speed:
2,800 rpm
Spark plug (resistor
type):
Bosch WSR 6 F,
NGK BPMR 7 A
Electrode gap:
0.5 mm
Fuel tank capacity:
0.67 l
Overall weight, dry, with
harness: 13.9 kg
Powerhead, dry:
12.8 kg
Shaft with hook:
1.1 kg
Opening:
42 mm
Stroke:
45 mm
Strokes per minute at
12,500 rpm:
3328
Overall length:
2865 mm
Shaft with hook:
1860 mm
SP 451:
102 dB(A)
SP 481:
102 dB(A)
SP 451:
113 dB(A)
SP 481:
113 dB(A)
Handle, left
Handle,
right
SP 451:
5.7 m/s
2
5.7 m/s
2
SP 481:
5.7 m/s
2
5.7 m/s
2