Specifications; Engine; Fuel System; Ignition System - Stihl MS 311 Service Manual

2.

Specifications

2.1

Engine

Displacement:
Bore:
Stroke:
Engine power to ISO 7293:
Maximum permissible engine speed
with guide bar and chain:
Idle speed:

Clutch:

Clutch engages at:
Engine housing leakage test
at gauge pressure:
under vacuum:
2.2

Fuel System

2.3

Ignition System

2.4 Chain Lubrication
MS 311, MS 391
MS 311
3
59 cm
47 mm
34 mm
3 kW (4 bhp)
at 9,500 rpm
13,000 rpm
2,800 rpm
Centrifugal clutch without
linings
3,500 rpm
0.5 bar
0.5 bar
Carburetor leakage test at
gauge pressure:
Operation of tank vent at
gauge pressure:
Fuel:
Air gap between ignition
module and fanwheel:
Spark plug (resistor type):
Electrode gap:
Speed-controlled oil pump with reciprocating piston and
manual flow control
Oil delivery rate:
Ematic oil pump
Oil delivery rate:
Adjustable oil pump
MS 391
3
64.1 cm
49 mm
34 mm
3.2 kW (4.4 bhp)
at 9,500 rpm
13,000 rpm
2,800 rpm
Centrifugal clutch without
linings
3,500 rpm
0.8 bar
0.5 bar
as specified in instruction
manual
0.20...0.30 mm
NGK BPMR 7 A
BOSCH WSR6F
0.5 mm
3
11.5 (+2.5) cm /min
at 10,000 rpm
6.0 (+/-2.0)...17.5 (+3.0 / -4.5)
3
cm /min at 10,000 rpm
5