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Specifications
Engine
STIHL single cylinder two-stroke engine
SP 451
Displacement:
44.3 cm
Bore:
42 mm
Stroke:
32 mm
Engine power to
2.1 kW (2.9 HP)
ISO 8893:
at 9,000 rpm
Cut-off speed
(rated):
12,500 rpm
Idle speed:
2,800 rpm
SP 481
Displacement:
48.7 cm
Bore:
44 mm
Stroke:
32 mm
Engine power to
2.2 kW (3.0 HP)
ISO 8893:
at 9,000 rpm
Cut-off speed
(rated):
12,500 rpm
Idle speed:
2,800 rpm
Ignition System
Electronic magneto ignition
Spark plug (resistor
Bosch WSR 6 F,
type):
NGK BPMR 7 A
Electrode gap:
0.5 mm
SP 451, SP 481
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity:
Weight
3
Overall weight, dry, with
harness:
Powerhead, dry:
Shaft with hook:
Hook
Opening:
Stroke:
Strokes per minute at
3
12,500 rpm:
Length
Overall length:
Shaft with hook:
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
ISO 11201
SP 451:
SP 481:
0.67 l
Sound power level L
SP 451:
SP 481:
Vibration measurement a
13.9 kg
ISO 20643
12.8 kg
1.1 kg
SP 451:
SP 481:
The K-factor in accordance with
42 mm
Directive 2006/42/EC is 2.5 dB(A) for
45 mm
the sound pressure level and sound
power level; the K-factor in accordance
3328
with Directive 2006/42/EC is 2.0 m/s
for the vibration measurement.
REACH
2865 mm
REACH is an EC regulation and stands
1860 mm
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.
English
to
peq
102 dB(A)
102 dB(A)
to ISO 3744
weq
113 dB(A)
113 dB(A)
to
hv,eq
Handle,
Handle, left
right
2
2
5.7 m/s
5.7 m/s
2
2
5.7 m/s
5.7 m/s
2
27
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