Stihl MS 311 Product Instruction Manual - Page 53

Specifications

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Specifications EPA / CEPA The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements. Category A = 300 hours B = 125 hours C = 50 hours Engine STIHL single cylinder two-stroke engine MS 311 Displacement: 3.60 cu. in. (59.0 cm3) Bore: 1.85 in. (47 mm) Stroke: 1.34 in. (34 mm) Engine power to ISO 7293: 4.2 hp (3.1 kW) at 9500 rpm Idle speed: 2800 rpm Maximum permissible speed with bar and chain: 13000 rpm MS 391 Displacement: 3.90 cu. in. (64.1 cm3) Bore: 1.93 in. (49 mm) Stroke: 1.34 in. (34 mm) Engine power to ISO 7293: 4.4 hp (3.3 kW) at 9500 rpm Idle speed: 2800 rpm Maximum permissible speed with bar and chain: 13000 rpm Ignition system Electronic magneto ignition Spark plug (suppressed): Electrode gap: NGK BPMR 7 A, Bosch WSR 6 F 0.02 in. (0.5 mm) Fuel system All position diaphragm carburetor with integral fuel pump Fuel tank capacity: 20.3 oz (0.60 l) Chain lubrication Fully automatic, speed-controlled oil pump with reciprocating piston - additional manual oil flow control Oil tank capacity: 11.8 oz (0.350 l) Weight English dry, without bar and chain MS 311: 14.1 lbs. (6.4 kg) MS 391: 14.1 lbs. (6.4 kg) Cutting attachment Recommended cutting attachments in compliance with Sec. 5.11 of ANSI standard B 175.1-2000 Observe the information about ANSI standard B 175.1-2000 as well as the definition "low-kickback saw chain" in the section "Safety Precautions and Working Techniques". Rollomatic E guide bars STIHL reduced kickback guide bars (with green label) Bar lengths: 16, 18, 20 in. (40, 45, 50 cm) Pitch: 3/8" (9.32 mm) Groove width: 0.050 in. (1.3 mm) or 0.063 in. (1.6 mm) Sprocket nose: 10- or 11-tooth Saw chains 3/8" STIHL reduced kickback saw chains (with green label) Rapid Micro Comfort 3 (33 RMC3) Rapid Micro Comfort 3 (36 RMC3) Rapid Super Comfort 3 (33 RSC3) Rapid Super Comfort 3 (36 RSC3) Pitch: 3/8" (9.32 mm) Drive link gauge: 0.050 in. (1.3 mm) or 0.063 in. (1.6 mm) MS 311, MS 391 51

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MS 311, MS 391
English
51
EPA / CEPA
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category
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
Recommended cutting attachments in
compliance with Sec. 5.11 of ANSI
standard B 175.1-2000
Observe the information about ANSI
standard B 175.1-2000 as well as the
definition "low-kickback saw chain" in
the section "Safety Precautions and
Working Techniques".
Rollomatic E guide bars
Saw chains 3/8"
Specifications
A = 300 hours
B = 125 hours
C = 50 hours
Displacement:
3.60 cu. in.
(59.0 cm
3)
Bore:
1.85 in. (47 mm)
Stroke:
1.34 in. (34 mm)
Engine power to
ISO 7293:
4.2 hp (3.1 kW)
at 9500 rpm
Idle speed:
2800 rpm
Maximum permissible
speed with bar and
chain:
13000 rpm
Displacement:
3.90 cu. in.
(64.1 cm
3
)
Bore:
1.93 in. (49 mm)
Stroke:
1.34 in. (34 mm)
Engine power to
ISO 7293:
4.4 hp (3.3 kW)
at 9500 rpm
Idle speed:
2800 rpm
Maximum permissible
speed with bar and
chain:
13000 rpm
Spark plug
(suppressed):
NGK BPMR 7 A,
Bosch WSR 6 F
Electrode gap:
0.02 in. (0.5 mm)
Fuel tank capacity:
20.3 oz (0.60 l)
Oil tank capacity:
11.8 oz (0.350 l)
dry, without bar and chain
MS 311:
14.1 lbs. (6.4 kg)
MS 391:
14.1 lbs. (6.4 kg)
STIHL reduced kickback guide bars
(with green label)
Bar lengths:
16, 18, 20 in. (40, 45,
50 cm)
Pitch:
3/8" (9.32 mm)
Groove width:
0.050 in. (1.3 mm) or
0.063 in. (1.6 mm)
Sprocket nose:
10- or 11-tooth
STIHL reduced kickback saw chains
(with green label)
Rapid Micro Comfort 3 (33 RMC3)
Rapid Micro Comfort 3 (36 RMC3)
Rapid Super Comfort 3 (33 RSC3)
Rapid Super Comfort 3 (36 RSC3)
Pitch:
3/8" (9.32 mm)
Drive link gauge:
0.050 in. (1.3 mm) or
0.063 in. (1.6 mm)