Specifications - Stihl MS 381 Instruction Manual

Specifications

Engine
STIHL single cylinder two-stroke engine
MS 381
Displacement: 72.2 cm
Bore: 52 mm
Stroke: 34 mm
Engine power to 3.9 kW
ISO 7293: (5.3 HP) at
9,500 rpm
1)
Idle speed: 2,800 rpm
2)
MS 381
Displacement: 72.2 cm
Bore: 52 mm
Stroke: 34 mm
Engine power to 3.3 kW (4.5 HP)
ISO 7293: at 9,500 rpm
1)
Idle speed: 2,400 rpm
1)
to ISO 11681 +/- 50 rpm
2)
low compression engine
Ignition System
Electronic magneto ignition
Spark plug (resistor
type): NGK BPMR 7 A
Electrode gap: 0.5 mm
MS 381
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity:
Chain Lubrication
3 Fully automatic, speed-controlled oil
pump with rotary piston. Additional
manual oil flow control
Oil tank capacity:
Weight
Weight (dry, without bar and chain):
MS 381:
3
MS 381 N:
Cutting attachment
Rollomatic guide bars
Cutting lengths: 37, 40, 45, 50, 63 cm
Pitch:
Groove width:
Duromatic guide bars
Cutting lengths: 37, 40, 45, 50, 63 cm
Pitch:
Groove width:
3/8" chain
Rapid Micro (36 RM) Type 3652
Rapid Super (36 RS) Type 3621
Rapid Super 3 (36 RS3) Type 3626
3
680 cm (0,68 l)
Pitch:
Drive link gauge: 1.6 mm
Chain sprocket
7-tooth for 3/8" P (rim sprocket)
Max. chain velocity to
ISO 11681
3
360 cm (0,36 l)
7-tooth for 3/8" P (spur sprocket)
Max. chain velocity to
ISO 11681
As a rule, the mean chain velocity in
operation is about 20% lower than the
6.6 kg
maximum chain velocity in accordance
6.6 kg
with ISO 11681. Contact your STIHL
servicing dealer for advice on personal
protective equipment.
Noise and Vibration Data
For further details on compliance with
3/8" (9.32 mm)
Vibration Directive 2002/44/EC see
www.stihl.com/vib.
1.6 mm
Sound pressure level L
MS 381:
MS 381 N:
3/8" (9.32 mm)
1.6 mm
Sound power level L
MS 381:
MS 381 N:
English
3/8" (9.32 mm)
27,5 m/s
27,5 m/s
to ISO 22868
peq
103 dB(A)
103 dB(A)
to ISO 22868
w
115 dB(A)
115 dB(A)
97