Owner's Manual

MS 291 C-Q
English
55
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
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
Recommended cutting attachments in
compliance with Sec. 5.11 of ANSI
standard B 175.1-2000
Observe the information about ANSI
standard B 175.1-2000 as well as the
definition "low-kickback saw chain" in
the section "Safety Precautions and
Working Techniques".
Rollomatic E guide bars
Saw chains 0.325"
Chain sprocket
In order to comply with the kickback
performance requirements of Sec. 5.11
of ANSI standard B 175.1-2000, do not
use replacement saw chains unless they
have been designated as meeting the
ANSI Sec. 5.11 requirements on this
specific engine unit, or have been
designated as "low kickback" saw
chains in accordance with the ANSI
B 175.1-2000 standard.
Since new bar/chain combinations may
be developed after publication of this
Manual, ask your STIHL dealer for the
latest STIHL recommendations.
Specifications
A = 300 hours
B = 125 hours
C = 50 hours
Displacement: 3.39 cu. in.
(55.5 cm
3
)
Bore: 1.85 in.
(47.0 mm)
Stroke: 1.26 in. (32 mm)
Engine power to
ISO 7293:
3.8 hp (2.8 kW)
at 9500 rpm
Idle speed: 2800 rpm
Maximum permissible
speed with bar and
chain: 13000 rpm
Spark plug
(suppressed):
Bosch WSR 6 F,
NGK BPMR 7 A
Electrode gap: 0.02 in. (0.5 mm)
Fuel tank capacity: 16.9 fl.oz (0.50 l)
Oil tank capacity: 8.1 fl.oz (0.24 l)
dry, without bar and
chain: 13.9 lbs. (6.3 kg)
STIHL reduced kickback guide bars
(with green label)
Bar lengths: 16, 18, 20 in. (40,
45, 50 cm)
Pitch: 0.325" (8.25 mm)
Groove width: 0.063 in. (1.6 mm)
Sprocket nose: 11 tooth
STIHL reduced kickback saw chain
(with green label)
Rapid Micro Comfort 3 (26 RMC3)
Pitch: 0.325" (8.25 mm)
Drive link gauge: 0.063 in. (1.6 mm)
7-tooth for .325“