Instruction Manual

28 Main Parts
19
3
11
14
24
22
23
4903BA009 KN
15
16
17
18
20
21
4
7
#
5
2
10
9
12
13
1
6
8
1 Shroud lock
2 Carburetor adjusting screws
3 Spark plug boot
4 Shutter (summer and winter operation)
5 Decompression valve
6 Chain brake
7 Chain sprocket
8 Chain sprocket cover
9 Chain catcher
10 Side chain tensioner
11 Spiked bumper
12 Guide bar
13 Oilomatic chain
14 Oil filler cap
15 Muffler (with Spark Arresting Screen, not
available in all markets)
16 Front hand guard
17 Front handle (handlebar)
18 Starter grip
19 Fuel filler cap
20 Master Control Lever
21 Throttle trigger
22 Throttle trigger lockout
23 Rear handle
24 Rear hand guard
# Serial Number
29 Specifications
29.1 Engine
STIHL single cylinder two-stroke engine
29.1.1 MS 311
Displacement:
59.0 cc
Bore: 47 mm
Stroke: 34 mm
Engine power to
ISO 7293:
3.1 kW (4.2 bhp) at
9,500 rpm
Idle speed:
1)
2,800 rpm
29.1.2 MS 391
Displacement:
64.1 cc
Bore: 49 mm
Stroke: 34 mm
Engine power to
ISO 7293:
3.3 kW (4.5 bhp) at
9,500 rpm
Idle speed:
1)
2,800 rpm
29.2 Ignition System
Electronic magneto ignition
Spark plug (resistor type): Bosch WSR 6 F,
NGK BPMR 7 A
Electrode gap: 0.5 mm
29.3 Fuel System
All position diaphragm carburetor with integral
fuel pump
Fuel tank capacity:
600 cc (0.6 l)
29.4 Chain Lubrication
Fully automatic, speed-controlled oil pump with
rotary piston. Additional manual oil flow control
Oil tank capacity:
350 cc (0.35 l)
29.5 Weight
Weight (dry, without bar and chain):
MS 311: 6.2 kg
MS 391: 6.2 kg
29.6 Cutting Attachment
Actual cutting length may be less than the speci‐
fied length
29.6.1 Rollomatic E guide bars
Cutting lengths: 37, 40, 45 cm
Pitch: 3/8" (9.32 mm)
1)
to ISO 11681 +/- 50 rpm
28 Main Parts English
0458-542-8321-D 37