Specifications - Stihl MS 311 Manual De Instrucciones

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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 cc)
Bore: 1.85 in (47 mm)
Stroke: 1.34 in (34 mm)
Engine power to 4.2 bhp (3.1 kW)
ISO 7293: at 9,500 rpm
Idle speed: 2,800 rpm
Max. permissible
speed (with cutting
attachment): 13,000 rpm
54
MS 391
Displacement: 3.90 cu.in
(64.1 cc)
Bore: 1.93 in (49 mm)
Stroke: 1.34 in (34 mm)
Engine power to 4.4 bhp (3.3 kW)
ISO 7293: at 9,500 rpm
Idle speed: 2,800 rpm
Max. permissible
speed (with cutting
attachment): 13,000 rpm
Ignition System
Electronic magneto ignition
Spark plug (resistor NGK BPMR 7 A,
type): Bosch WSR 6 F
Electrode gap: 0.02 in (0.5 mm)
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity: 20.3 fl.oz (0.60 l)
Chain Lubrication
Fully automatic, speed-controlled oil
pump with rotary piston. Additional
manual oil flow control
Oil tank capacity: 11.8 fl.oz (0.350 l)
Weight
dry, without bar and chain
MS 311: 13.7 lbs (6.2 kg)
MS 391: 13.7 lbs (6.2 kg)
Cutting Attachments
Recommended cutting attachments
conforming with the 45 degree
computed kickback angle requirement
of Section 5.11 of
ANSI/OPEI B175.1-2012 when used on
this model chain saw (see the chapter
on "Safety Precautions and Working
Techniques"):
Rollomatic E guide bars
Reduced kickback STIHL guide bars
(with green label)
Bar lengths: 40, 45, 50 cm (16, 18,
20 in.)
Pitch: 3/8" (9.32 mm)
Groove width: 1.3 mm (0.050 in) or
1.6 mm (0.063 in.)
Sprocket nose: 10-tooth
Actual cutting length will be less than
listed bar length.
Saw chain 3/8"
Low kickback STIHL saw chain (with
green label)
Rapid Micro 3 (33 RM3) Type 3662
Rapid Super 3 (33 RS3) Type 3624
Pitch: 3/8" (9.32 mm)
Drive link gauge: 1.3 mm (0.050 in)
MS 311, MS 391