Stihl MS 391 Safety Manual

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

Stihl MS 391 Specifications

General

Motor type	2-stroke motor
Chain gauge	1.6 mm
Chain pitch	3/8 \
Automatic oiling	Yes
Oil tank capacity	0.35 L
Fuel tank capacity	0.6 L
Engine displacement	64.1 cm³
Engine power	4.4 hp
Power source	Gasoline

Weight and Dimensions

Weight	6200 g