Specifications - Stihl MS 291 Instruction Manual

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Specifications

Engine
STIHL single cylinder two-stroke engine
MS 271
Displacement: 50.2 cc
Bore: 44.7 mm
Stroke: 32 mm
Engine power to 2.6 kW (3.5 bhp)
ISO 7293: at 9,500 rpm
1)
Idle speed: 2,800 rpm
MS 291, MS 291 C
Displacement: 55.5 cc
Bore: 47.0 mm
Stroke: 32 mm
Engine power to 2.8 kW (3.8 HP)
ISO 7293: at 9,500 rpm
1
Idle speed: 2,800 rpm
1)
to ISO 11681 +/- 50 rpm
Ignition System
Electronic magneto ignition
Spark plug (resistor Bosch WSR 6 F,
type): NGK BPMR 7 A
Electrode gap: 0.5 mm
Fuel System
All position diaphragm carburetor with
integral fuel pump
46
Fuel tank capacity: 500 cc (0.5 l)
Chain Lubrication
Fully automatic, speed-controlled oil
pump with rotary piston
Oil tank capacity: 240 cc (0.24 l)
Weight
dry, without bar and chain
MS 271:
MS 291:
MS 291 C with ErgoStart and
quick chain tensioner:
Cutting Attachment (MS 271)
.325" chain
Rapid Micro (26 RM) Type 3629
Rapid Micro 3 (26 RM3) Type 3634
Rapid Super (26 RS) Type 3639
Pitch: .325" (8.25 mm)
Drive link gauge: 1.6 mm
Rollomatic E guide bars
Cutting lengths: 32, 37, 40 cm
Pitch: .325" (8.25 mm)
Groove width: 1.6 mm
Nose sprocket: 11-tooth
Chain sprocket
7-tooth for .325"
Max. chain speed according
to ISO 11681:
Chain speed at maximum
power output:
Cutting Attachments for MS 291,
MS 291 C
.325" chain
5.6 kg
Rapid Micro (26 RM) Type 3629
5.6 kg
Rapid Micro 3 (26 RM3) Type 3634
6.2 kg
Rapid Super (26 RS) Type 3639
Pitch:
Drive link gauge:
Rollomatic E guide bars
Cutting lengths:
Pitch:
Groove width:
Nose sprocket:
3/8" chains
Rapid Micro (36 RM) Type 3652
Rapid Micro 3 (36 RM3) Type 3664
Rapid Super (36 RS) Type 3621
Rapid Super 3 (36 RS3) Type 3626
Pitch:
Drive link gauge:
Rollomatic E guide bars
Cutting lengths:
Pitch:
Groove width:
Nose sprocket:
MS 271, MS 271 C, MS 291, MS 291 C
24.4 m/s
19.3 m/s
.325" (8.25 mm)
1.6 mm
37, 40, 45 cm
.325" (8.25 mm)
1.6 mm
11-tooth
3/8" (9.32 mm)
1.6 mm
37, 40, 45 cm
3/8" (9.32 mm)
1.6 mm
11-tooth