Instruction Manual

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