Instruction Manual

MS 271, MS 271 C, MS 291, MS 291 C
English
50
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
Engine
STIHL single cylinder two-stroke engine
MS 271, MS 271 C
MS 291, MS 291 C
Ignition system
Electronic magneto ignition
This ignition system fulfills all
requirements of the Canadian
Interference-Causing Equipment
Standard CAN ICES-2/NMB-2.
Fuel system
All-position diaphragm carburetor with
integral fuel pump
Chain lubrication
Fully automatic, speed-controlled oil
pump with rotary piston
Weight
Cutting attachment
The actual bar length may be less than
the specified bar length.
STIHL cutting attachments complying
with CSA Standard Z 62.3:
Rollomatic E guide bars
Saw chains .325"
Sprocket
Additional cutting attachments
Other cutting attachments complying
with CSA Standard Z 62.3 are available:
see section CSA-Standard Z 62.3,
"Information Sheet" in saw chain
packaging or ask a STIHL servicing
dealer.
Specifications
A = 300 hours
B = 125 hours
C = 50 hours
Displacement: 50.2 cc
Cylinder bore: 44.7 mm
Piston stroke: 32 mm
Engine power accord-
ing to ISO 7293:
2.6 kW (3.5 HP)
at 9500 rpm
Idle speed: 2800 rpm
Maximum permissible
speed with cutting
attachment: 13,000 rpm
Displacement: 55.5 cc
Cylinder bore: 47.0 mm
Piston stroke: 32 mm
Engine power accord-
ing to ISO 7293:
2.8 kW (3.8 HP)
at 9500 rpm
Idle speed: 2800 rpm
Maximum permissible
speed with cutting
attachment: 13,000 rpm
Spark plug
(suppressed):
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 cutting attachment
MS 271: 5.6 kg
MS 271 C with Easy2Start and
Quick Chain Tensioner: 6.2 kg
MS 291: 5.6 kg
MS 291 C with Easy2Start and
Quick Chain Tensioner: 6.2 kg
Bar lengths: 40, 45, 50 cm
Pitch: .325" (8.25 mm)
Groove width: 1.6 mm
Sprocket nose: 11 tooth
Rapid Micro 3 (26 RM3) Type 3634
Pitch: .325" (8.25 mm)
Drive link gauge: 1.6 mm
7-tooth for .325"
Dry, without cutting attachment