Specifications - Stihl MS 391 Safety Manual

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Specifications

Engine
STIHL single cylinder two-stroke engine
MS 311
Displacement: 59.0 cm
Bore: 47 mm
Stroke: 34 mm
Engine power to 3.1 kW (4.2 HP)
ISO 7293: at 9500 rpm
Idle speed: 2800 rpm
Maximum permissible
speed with bar and
chain: 13000 rpm
MS 391
Displacement: 64.1 cm
Bore: 49 mm
Stroke: 34 mm
Engine power to 3.3 kW (4.5 HP)
ISO 7293: at 9500 rpm
Idle speed: 2800 rpm
Maximum permissible
speed with bar and
chain: 13000 rpm
Ignition system
Electronic magneto ignition
Spark plug Bosch WSR 6 F,
(suppressed): NGK BPMR 7 A
Electrode gap: 0.5 mm
42
Fuel system
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity:
Chain lubrication
3 Fully automatic, speed-controlled oil
pump with reciprocating piston -
additional manual oil flow control
Oil tank capacity:
Weight
dry, without bar and chain
MS 311:
MS 391:
3
Cutting attachment
Rollomatic E guide bars
Bar lengths:
Pitch:
Groove width:
Sprocket nose:
Saw chains 3/8"
Rapid Micro Comfort (36 RMC)
Rapid Super Comfort (36 RSC)
Rapid Super Comfort 3 (36 RSC3)
Pitch:
Drive link gauge:
Chain sprockets
7-tooth for 3/8" (rim sprocket)
Sound and vibration levels
0.60 l
The idle, full-throttle and nominal
maximum speed are given equal
consideration when calculating sound
and vibration levels.
For further details concerning
compliance with the employers'
Directive on vibration 2002/44/EC, see
0.350 l
www.stihl.com/vib/
Sound pressure level L
ISO 22868
MS 311:
MS 391:
6.4 kg
6.4 kg
Sound power level L
MS 311:
MS 391:
Vibration level a
37, 40, 45 cm
3/8" (9.32 mm)
1.6 mm MS 311:
10-tooth MS 391:
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
for the vibration measurement.
3/8" (9.32 mm)
1.6 mm
to
peq
105 dB(A)
105 dB(A)
to ISO 22868
weq
115 dB(A)
115 dB(A)
to ISO 22867
hv, eq
Handle,
Handle, left right
2 2
4,0 m/s 4,0 m/s
2 2
4,0 m/s 4,0 m/s
2
MS 311, MS 391